1
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Vorwerk C, Sottile F, Draxl C. All-Electron many-body approach to resonant inelastic x-ray scattering. Phys Chem Chem Phys 2022; 24:17439-17448. [DOI: 10.1039/d2cp00994c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a formalism for the resonant inelastic x-ray scattering (RIXS) cross section. The resulting compact expression in terms of polarizability matrix elements, particularly lends itself to the implementation in...
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2
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Wu Y, Jiang Z, Tan H, Li Y, Duan W. Accuracy trade-off between one-electron and excitonic spectra of cuprous halides in first-principles calculations. J Chem Phys 2021; 154:134704. [PMID: 33832243 DOI: 10.1063/5.0043999] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Because of the sophisticated error cancellation in the density functional theory (DFT)-based calculations, a theoretically more accurate input would not guarantee a better output. In this work, our first-principles GW plus Bethe-Salpeter equation calculations using pseudopotentials show that cuprous halides (CuCl and CuBr) are such extreme cases for which a better one-electron band is not accompanied with a better exciton binding energy. Moreover, we find that the exchange interaction of Cu core electrons plays a crucial role in their ground-state electronic properties, especially in the energy gap and macroscopic dielectric constant. Our work provides new insights into the understanding of the electronic structure of cuprous halides from the DFT perspective.
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Affiliation(s)
- Yujing Wu
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
| | - Zeyu Jiang
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Hengxin Tan
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Yuanchang Li
- Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) and Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China
| | - Wenhui Duan
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
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3
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Moreno-López JC, Fedi F, Argentero G, Carini M, Chimborazo J, Meyer J, Pichler T, Mateo-Alonso A, Ayala P. Exclusive Substitutional Nitrogen Doping on Graphene Decoupled from an Insulating Substrate. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2020; 124:22150-22157. [PMID: 33072238 PMCID: PMC7552092 DOI: 10.1021/acs.jpcc.0c06415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/31/2020] [Indexed: 06/01/2023]
Abstract
The on-surface synthesis of atomically flat N-doped graphene on oxidized copper is presented. Besides circumventing the almost standard use of metallic substrates for growth, this method allows producing graphene with ∼2.0 at % N in a substitutional configuration directly decoupled from the substrate. Angle-resolved photoemission shows a linear energy-momentum dispersion where the Dirac point lies at the Fermi level. Additionally, the N functional centers can be selectively tailored in sp2 substitutional configuration by making use of a purpose-made molecular precursor: dicyanopyrazophenanthroline (C16H6N6).
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Affiliation(s)
| | - Filippo Fedi
- Faculty
of Physics, University of Vienna, 1090 Wien, Austria
| | | | - Marco Carini
- POLYMAT,
University of the Basque Country UPV/EHU, Avenida de Tolosa 72, E-20018 Donostia-San Sebastian, Spain
| | | | - Jannik Meyer
- Faculty
of Physics, University of Vienna, 1090 Wien, Austria
| | - Thomas Pichler
- Faculty
of Physics, University of Vienna, 1090 Wien, Austria
| | - Aurelio Mateo-Alonso
- Faculty
of Physics, University of Vienna, 1090 Wien, Austria
- Ikerbasque,
Basque Foundation for Science, 48013 Bilbao, Spain
| | - Paola Ayala
- Faculty
of Physics, University of Vienna, 1090 Wien, Austria
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4
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Byun YM, Öğüt S. Practical GW scheme for electronic structure of 3d-transition-metal monoxide anions: ScO -, TiO -, CuO -, and ZnO . J Chem Phys 2019; 151:134305. [PMID: 31594362 DOI: 10.1063/1.5118671] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The GW approximation to many-body perturbation theory is a reliable tool for describing charged electronic excitations, and it has been successfully applied to a wide range of extended systems for several decades using a plane-wave basis. However, the GW approximation has been used to test limited spectral properties of a limited set of finite systems (e.g., frontier orbital energies of closed-shell sp molecules) only for about a decade using a local-orbital basis. Here, we calculate the quasiparticle spectra of closed- and open-shell molecular anions with partially and completely filled 3d shells (shallow and deep 3d states, respectively), ScO-, TiO-, CuO-, and ZnO-, using various levels of GW theory, and compare them to experiments to evaluate the performance of the GW approximation on the electronic structure of small molecules containing 3d transition metals. We find that the G-only eigenvalue self-consistent GW scheme with W fixed to the PBE level (GnW0@PBE), which gives the best compromise between accuracy and efficiency for solids, also gives good results for both localized (d) and delocalized (sp) states of 3d-transition-metal oxide molecules. The success of GnW0@PBE in predicting electronic excitations in these systems reasonably well is likely due to the fortuitous cancellation effect between the overscreening of the Coulomb interaction by PBE and the underscreening by the neglect of vertex corrections. Together with the absence of the self-consistent field convergence error (e.g., spin contamination in open-shell systems) and the GW multisolution issue, the GnW0@PBE scheme gives the possibility to predict the electronic structure of complex real systems (e.g., molecule-solid and sp-d hybrid systems) accurately and efficiently.
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Affiliation(s)
- Young-Moo Byun
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Serdar Öğüt
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
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5
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Golze D, Dvorak M, Rinke P. The GW Compendium: A Practical Guide to Theoretical Photoemission Spectroscopy. Front Chem 2019; 7:377. [PMID: 31355177 PMCID: PMC6633269 DOI: 10.3389/fchem.2019.00377] [Citation(s) in RCA: 133] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 05/08/2019] [Indexed: 12/22/2022] Open
Abstract
The GW approximation in electronic structure theory has become a widespread tool for predicting electronic excitations in chemical compounds and materials. In the realm of theoretical spectroscopy, the GW method provides access to charged excitations as measured in direct or inverse photoemission spectroscopy. The number of GW calculations in the past two decades has exploded with increased computing power and modern codes. The success of GW can be attributed to many factors: favorable scaling with respect to system size, a formal interpretation for charged excitation energies, the importance of dynamical screening in real systems, and its practical combination with other theories. In this review, we provide an overview of these formal and practical considerations. We expand, in detail, on the choices presented to the scientist performing GW calculations for the first time. We also give an introduction to the many-body theory behind GW, a review of modern applications like molecules and surfaces, and a perspective on methods which go beyond conventional GW calculations. This review addresses chemists, physicists and material scientists with an interest in theoretical spectroscopy. It is intended for newcomers to GW calculations but can also serve as an alternative perspective for experts and an up-to-date source of computational techniques.
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Affiliation(s)
- Dorothea Golze
- Department of Applied Physics, Aalto University, School of Science, Espoo, Finland
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6
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Córdova-Castro RM, Casavola M, van Schilfgaarde M, Krasavin AV, Green MA, Richards D, Zayats AV. Anisotropic Plasmonic CuS Nanocrystals as a Natural Electronic Material with Hyperbolic Optical Dispersion. ACS NANO 2019; 13:6550-6560. [PMID: 31117375 DOI: 10.1021/acsnano.9b00282] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Copper sulfide nanocrystals have recently been studied due to their metal-like behavior and strong plasmonic response, which make them an attractive material for nanophotonic applications in the near-infrared spectral range; however, the nature of the plasmonic response remains unclear. We have performed a combined experimental and theoretical study of the optical properties of copper sulfide colloidal nanocrystals and show that bulk CuS resembles a heavily doped p-type semiconductor with a very anisotropic energy band structure. As a consequence, CuS nanoparticles possess key properties of relevance to nanophotonics applications: they exhibit anisotropic plasmonic behavior in the infrared and support optical modes with hyperbolic dispersion in the 670-1050 nm spectral range. We also predict that the ohmic loss is low compared to conventional plasmonic materials such as noble metals in the NIR. The plasmonic resonances can be tuned by controlling the size and shape of the nanocrystals, providing a playground for future nanophotonic applications in the near-infrared.
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Affiliation(s)
- R Margoth Córdova-Castro
- Department of Physics and London Centre for Nanotechnology , King's College London , London WC2R 2LS , United Kingdom
| | - Marianna Casavola
- Department of Physics and London Centre for Nanotechnology , King's College London , London WC2R 2LS , United Kingdom
| | - Mark van Schilfgaarde
- Department of Physics and London Centre for Nanotechnology , King's College London , London WC2R 2LS , United Kingdom
| | - Alexey V Krasavin
- Department of Physics and London Centre for Nanotechnology , King's College London , London WC2R 2LS , United Kingdom
| | - Mark A Green
- Department of Physics and London Centre for Nanotechnology , King's College London , London WC2R 2LS , United Kingdom
| | - David Richards
- Department of Physics and London Centre for Nanotechnology , King's College London , London WC2R 2LS , United Kingdom
| | - Anatoly V Zayats
- Department of Physics and London Centre for Nanotechnology , King's College London , London WC2R 2LS , United Kingdom
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7
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Abstract
The nature of bonding in the cubic cuprous oxide is studied by means of the theoretical tools, namely, the electron localization function and Compton profiles. The isotropic Compton profiles together with the anisotropies in the directional Compton profiles are presented. Taking free-atom Compton profiles, the charge-transfer model is also applied. The first-principles calculations based on the GGA are performed, and the self-interaction correction is incorporated, adopting the GGA+U approach. Both types of calculations are performed deploying the linearized augmented plane-wave (LAPW) method. The effect of self-interaction correction on the electron localization function, Compton profiles, and anisotropies is discussed. The electron localization function reveals ionic behavior in the (110) plane and covalent nature in the Cu-O bond intersecting plane. The GGA+U exhibits more covalent nature. The two LAPW calculations of the Compton profiles show better agreement with the available experimental data than the free-atom profiles. Among all of the calculations undertaken, the GGA+U shows the best agreement with the experiment. The GGA+U calculation shows more anisotropic behavior in directional Compton profiles.
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Affiliation(s)
- V Maurya
- Department of Physics , M.L. Sukhadia University , Udaipur 313001 , India
| | - K B Joshi
- Department of Physics , M.L. Sukhadia University , Udaipur 313001 , India
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8
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Neppl S, Mahl J, Tremsin AS, Rude B, Qiao R, Yang W, Guo J, Gessner O. Towards efficient time-resolved X-ray absorption studies of electron dynamics at photocatalytic interfaces. Faraday Discuss 2018; 194:659-682. [PMID: 27711854 DOI: 10.1039/c6fd00125d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We present a picosecond time-resolved X-ray absorption spectroscopy (tr-XAS) setup designed for synchrotron-based studies of interfacial photochemical dynamics. The apparatus combines a high power, variable repetition rate picosecond laser system with a time-resolved X-ray fluorescence yield detection technique. Time-tagging of the detected fluorescence signals enables the parallel acquisition of X-ray absorption spectra at a variety of pump-probe delays employing the well-defined time structure of the X-ray pulse trains. The viability of the setup is demonstrated by resolving dynamic changes in the fine structure near the O1s X-ray absorption edge of cuprous oxide (Cu2O) after photo-excitation with a 355 nm laser pulse. Two distinct responses are detected. A pronounced, quasi-static, reversible change of the Cu2O O1s X-ray absorption spectrum by up to ∼30% compared to its static line shape corresponds to a redshift of the absorption edge by ∼1 eV. This value is small compared to the 2.2 eV band gap of Cu2O but in agreement with previously published results. The lifetime of this effect exceeds the laser pulse-to-pulse period of 8 μs, resulting in a quasi-static spectral change that persists as long as the sample is exposed to the laser light, and completely vanishes once the laser is blocked. Additionally, a short-lived response corresponding to a laser-induced shift of the main absorption line by ∼2 eV to lower energies appears within <200 ps and decays with a characteristic timescale of 43 ± 5 ns. Both the picosecond rise and nanosecond decay of this X-ray response are simultaneously captured by making use of a time-tagging approach - highlighting the prospects of the experimental setup for efficient probing of the electronic and structural dynamics in photocatalytic systems on multiple timescales.
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Affiliation(s)
- Stefan Neppl
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
| | - Johannes Mahl
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
| | - Anton S Tremsin
- Space Sciences Laboratory, University of California, Berkeley, California, USA
| | - Bruce Rude
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Ruimin Qiao
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Wanli Yang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Jinghua Guo
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Oliver Gessner
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
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9
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Gerosa M, Bottani CE, Di Valentin C, Onida G, Pacchioni G. Accuracy of dielectric-dependent hybrid functionals in the prediction of optoelectronic properties of metal oxide semiconductors: a comprehensive comparison with many-body GW and experiments. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:044003. [PMID: 29087359 DOI: 10.1088/1361-648x/aa9725] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Understanding the electronic structure of metal oxide semiconductors is crucial to their numerous technological applications, such as photoelectrochemical water splitting and solar cells. The needed experimental and theoretical knowledge goes beyond that of pristine bulk crystals, and must include the effects of surfaces and interfaces, as well as those due to the presence of intrinsic defects (e.g. oxygen vacancies), or dopants for band engineering. In this review, we present an account of the recent efforts in predicting and understanding the optoelectronic properties of oxides using ab initio theoretical methods. In particular, we discuss the performance of recently developed dielectric-dependent hybrid functionals, providing a comparison against the results of many-body GW calculations, including G 0 W 0 as well as more refined approaches, such as quasiparticle self-consistent GW. We summarize results in the recent literature for the band gap, the band level alignment at surfaces, and optical transition energies in defective oxides, including wide gap oxide semiconductors and transition metal oxides. Correlated transition metal oxides are also discussed. For each method, we describe successes and drawbacks, emphasizing the challenges faced by the development of improved theoretical approaches. The theoretical section is preceded by a critical overview of the main experimental techniques needed to characterize the optoelectronic properties of semiconductors, including absorption and reflection spectroscopy, photoemission, and scanning tunneling spectroscopy (STS).
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Affiliation(s)
- M Gerosa
- Institute for Molecular Engineering, University of Chicago, Chicago, IL 60637, United States of America
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10
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Ismail-Beigi S. Justifying quasiparticle self-consistent schemes via gradient optimization in Baym-Kadanoff theory. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:385501. [PMID: 28593935 DOI: 10.1088/1361-648x/aa7803] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The question of which non-interacting Green's function 'best' describes an interacting many-body electronic system is both of fundamental interest as well as of practical importance in describing electronic properties of materials in a realistic manner. Here, we study this question within the framework of Baym-Kadanoff theory, an approach where one locates the stationary point of a total energy functional of the one-particle Green's function in order to find the total ground-state energy as well as all one-particle properties such as the density matrix, chemical potential, or the quasiparticle energy spectrum and quasiparticle wave functions. For the case of the Klein functional, our basic finding is that minimizing the length of the gradient of the total energy functional over non-interacting Green's functions yields a set of self-consistent equations for quasiparticles that is identical to those of the quasiparticle self-consistent GW (QSGW) (van Schilfgaarde et al 2006 Phys. Rev. Lett. 96 226402-4) approach, thereby providing an a priori justification for such an approach to electronic structure calculations. In fact, this result is general, applies to any self-energy operator, and is not restricted to any particular approximation, e.g., the GW approximation for the self-energy. The approach also shows that, when working in the basis of quasiparticle states, solving the diagonal part of the self-consistent Dyson equation is of primary importance while the off-diagonals are of secondary importance, a common observation in the electronic structure literature of self-energy calculations. Finally, numerical tests and analytical arguments show that when the Dyson equation produces multiple quasiparticle solutions corresponding to a single non-interacting state, minimizing the length of the gradient translates into choosing the solution with largest quasiparticle weight.
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Affiliation(s)
- Sohrab Ismail-Beigi
- Department of Applied Physics, Department of Physics, Department of Mechanical Engineering and Materials Science, and Center for Research on Interface Structures and Phenomena, Yale University, New Haven, CT 06520, United States of America
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11
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Tripathi TS, Terasaki I, Karppinen M. Anomalous thickness-dependent optical energy gap of ALD-grown ultra-thin CuO films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:475801. [PMID: 27633587 DOI: 10.1088/0953-8984/28/47/475801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Usually an inverse square relation between the optical energy gap and the size of crystallites is observed for semiconducting materials due to the strong quantum localization effect. Coulomb attraction that may lead to a proportional dependence is often ignored or considered less important to the optical energy gap when the crystallite size or the thickness of a thin film changes. Here we report a proportional dependence between the optical energy gap and the thickness of ALD-grown CuO thin films due to a strong Coulomb attraction. The ultrathin films deposited in the thickness range of 9-81 nm show a p-type semiconducting behavior when analyzed by Seebeck coefficient and electrical resistivity measurements. The indirect optical energy gap nature of the films is verified from UV-vis spectrophotometric measurements. A progressive increase in the indirect optical energy gap from 1.06 to 1.24 eV is observed with the increase in the thickness of the films. The data are analyzed in the presence of Coulomb attractions using the Brus model. The optical energy gap when plotted against the cubic root of the thickness of the films shows a linear dependence.
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Affiliation(s)
- T S Tripathi
- Department of Chemistry, Aalto University, PO Box 16100, FI-00076 Aalto, Finland
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12
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Kaplan F, Harding ME, Seiler C, Weigend F, Evers F, van Setten MJ. Quasi-Particle Self-Consistent GW for Molecules. J Chem Theory Comput 2016; 12:2528-41. [DOI: 10.1021/acs.jctc.5b01238] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- F. Kaplan
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Campus North, D-76344 Karlsruhe, Germany
| | - M. E. Harding
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Campus North, D-76344 Karlsruhe, Germany
| | - C. Seiler
- Institute
of Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany
| | - F. Weigend
- Institute
of Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany
- Institute
of Physical Chemistry, Karlsruhe Institute of Technology, Campus
South, D-76021 Karlsruhe, Germany
| | - F. Evers
- Institute
of Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany
| | - M. J. van Setten
- Nanoscopic
Physics, Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
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13
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Zhou JS, Kas JJ, Sponza L, Reshetnyak I, Guzzo M, Giorgetti C, Gatti M, Sottile F, Rehr JJ, Reining L. Dynamical effects in electron spectroscopy. J Chem Phys 2015; 143:184109. [DOI: 10.1063/1.4934965] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jianqiang Sky Zhou
- Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA-DSM-IRAMIS, Université Paris-Saclay, F-91128 Palaiseau, France
- European Theoretical Spectroscopy Facility (ETSF)
| | - J. J. Kas
- European Theoretical Spectroscopy Facility (ETSF)
- Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
| | - Lorenzo Sponza
- Department of Physics, King’s College London, London WC2R 2LS, United Kingdom
| | - Igor Reshetnyak
- Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA-DSM-IRAMIS, Université Paris-Saclay, F-91128 Palaiseau, France
- European Theoretical Spectroscopy Facility (ETSF)
| | - Matteo Guzzo
- Institut für Physik und IRIS Adlershof, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
| | - Christine Giorgetti
- Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA-DSM-IRAMIS, Université Paris-Saclay, F-91128 Palaiseau, France
- European Theoretical Spectroscopy Facility (ETSF)
| | - Matteo Gatti
- Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA-DSM-IRAMIS, Université Paris-Saclay, F-91128 Palaiseau, France
- European Theoretical Spectroscopy Facility (ETSF)
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette, France
| | - Francesco Sottile
- Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA-DSM-IRAMIS, Université Paris-Saclay, F-91128 Palaiseau, France
- European Theoretical Spectroscopy Facility (ETSF)
| | - J. J. Rehr
- European Theoretical Spectroscopy Facility (ETSF)
- Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
| | - Lucia Reining
- Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA-DSM-IRAMIS, Université Paris-Saclay, F-91128 Palaiseau, France
- European Theoretical Spectroscopy Facility (ETSF)
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14
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Kaplan F, Weigend F, Evers F, van Setten MJ. Off-Diagonal Self-Energy Terms and Partially Self-Consistency in GW Calculations for Single Molecules: Efficient Implementation and Quantitative Effects on Ionization Potentials. J Chem Theory Comput 2015; 11:5152-60. [DOI: 10.1021/acs.jctc.5b00394] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- F. Kaplan
- Institute
of Nanotechnology, Karlsruhe Institute of Technology, Campus North, D-76344 Karlsruhe, Germany
| | - F. Weigend
- Institute
of Nanotechnology, Karlsruhe Institute of Technology, Campus North, D-76344 Karlsruhe, Germany
- Institute
of Physical Chemistry, Karlsruhe Institute of Technology, Campus
South, D-76021 Karlsruhe, Germany
| | - F. Evers
- Institute
of Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany
| | - M. J. van Setten
- Nanoscopic
Physics, Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, bte
L7.03.01, 1348 Louvain-la-Neuve, Belgium
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15
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Lany S. Semiconducting transition metal oxides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:283203. [PMID: 26126022 DOI: 10.1088/0953-8984/27/28/283203] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Open shell transition metal oxides are usually described as Mott or charge transfer insulators, which are often viewed as being disparate from semiconductors. Based on the premise that the presence of a correlated gap and semiconductivity are not mutually exclusive, this work reviews electronic structure calculations on the binary 3d oxides, so to distill trends and design principles for semiconducting transition metal oxides. This class of materials possesses the potential for discovery, design, and development of novel functional semiconducting compounds, e.g. for energy applications. In order to place the 3d orbitals and the sp bands into an integrated picture, band structure calculations should treat both contributions on the same footing and, at the same time, account fully for electron correlation in the 3d shell. Fundamentally, this is a rather daunting task for electronic structure calculations, but quasi-particle energy calculations in GW approximation offer a viable approach for band structure predictions in these materials. Compared to conventional semiconductors, the inherent multivalent nature of transition metal cations is more likely to cause undesirable localization of electron or hole carriers. Therefore, a quantitative prediction of the carrier self-trapping energy is essential for the assessing the semiconducting properties and to determine whether the transport mechanism is a band-like large-polaron conduction or a small-polaron hopping conduction. An overview is given for the binary 3d oxides on how the hybridization between the 3d crystal field symmetries with the O-p orbitals of the ligands affects the effective masses and the likelihood of electron and hole self-trapping, identifying those situations where small masses and band-like conduction are more likely to be expected. The review concludes with an illustration of the implications of the increased electronic complexity of transition metal cations on the defect physics and doping, using as an example the diversity of possible atomic and magnetic configurations of the O vacancy in TiO(2), and the high levels of hole doping in Co(2)ZnO(4) due to a self-doping mechanism that originates from the multivalence of Co.
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Affiliation(s)
- Stephan Lany
- National Renewable Energy Laboratory, Golden, CO 80401, USA
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16
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Toparli C, Sarfraz A, Erbe A. A new look at oxide formation at the copper/electrolyte interface by in situ spectroscopies. Phys Chem Chem Phys 2015; 17:31670-9. [DOI: 10.1039/c5cp05172j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The oxide layer passivating copper consists mainly of a complex, defect-rich oxide on the basis of copper mixed oxide, Cu4O3.
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Affiliation(s)
- Cigdem Toparli
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf
- Germany
| | - Adnan Sarfraz
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf
- Germany
| | - Andreas Erbe
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf
- Germany
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Samsonidze G, Park CH, Kozinsky B. Insights and challenges of applying the GW method to transition metal oxides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:475501. [PMID: 25351575 DOI: 10.1088/0953-8984/26/47/475501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The ab initio GW method is considered as the most accurate approach for calculating the band gaps of semiconductors and insulators. Yet its application to transition metal oxides (TMOs) has been hindered by the failure of traditional approximations developed for conventional semiconductors. In this work, we examine the effects of these approximations on the values of band gaps for ZnO, Cu2O, and TiO2. In particular, we explore the origin of the differences between the two widely used plasmon-pole models. Based on the comparison of our results with the experimental data and previously published calculations, we discuss which approximations are suitable for TMOs and why.
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Affiliation(s)
- Georgy Samsonidze
- Research and Technology Center, Robert Bosch LLC, Cambridge, MA 02142, USA
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18
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Körbel S, Boulanger P, Duchemin I, Blase X, Marques MAL, Botti S. Benchmark Many-Body GW and Bethe–Salpeter Calculations for Small Transition Metal Molecules. J Chem Theory Comput 2014; 10:3934-43. [DOI: 10.1021/ct5003658] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sabine Körbel
- Institut
Lumière Matière and European
Theoretical Spectroscopy Facility, UMR5306 Université
Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France
| | - Paul Boulanger
- Univ. Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France
- CNRS, Inst NEEL, F-38042 Grenoble, France
| | - Ivan Duchemin
- INAC, SP2M/L_sim, CEA cedex 09, 38054 Grenoble, France
| | - Xavier Blase
- Univ. Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France
- CNRS, Inst NEEL, F-38042 Grenoble, France
| | - Miguel A. L. Marques
- Institut
Lumière Matière and European
Theoretical Spectroscopy Facility, UMR5306 Université
Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France
| | - Silvana Botti
- Institut
Lumière Matière and European
Theoretical Spectroscopy Facility, UMR5306 Université
Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France
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19
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Sinha B, Goswami T, Paul S, Misra A. The impact of surface structure and band gap on the optoelectronic properties of Cu2O nanoclusters of varying size and symmetry. RSC Adv 2014. [DOI: 10.1039/c3ra45387a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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20
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Bendavid LI, Carter EA. Status in Calculating Electronic Excited States in Transition Metal Oxides from First Principles. Top Curr Chem (Cham) 2014; 347:47-98. [DOI: 10.1007/128_2013_503] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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21
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Bruneval F, Gatti M. Quasiparticle Self-Consistent GW Method for the Spectral Properties of Complex Materials. Top Curr Chem (Cham) 2014; 347:99-135. [DOI: 10.1007/128_2013_460] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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22
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Botti S, Marques MAL. Strong renormalization of the electronic band gap due to lattice polarization in the GW formalism. PHYSICAL REVIEW LETTERS 2013; 110:226404. [PMID: 23767740 DOI: 10.1103/physrevlett.110.226404] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Indexed: 06/02/2023]
Abstract
The self-consistent GW band gaps are known to be significantly overestimated. We show that this overestimation is, to a large extent, due to the neglect of the contribution of the lattice polarization to the screening of the electron-electron interaction. To solve this problem, we derive within the GW formalism a generalized plasmon-pole model that accounts for lattice polarization. The resulting GW self-energy is used to calculate the band structures of a set of binary semiconductors and insulators. The lattice contribution always decreases the band gap. The shrinkage increases with the size of the longitudinal-transverse optical splitting and it can represent more than 15% of the band gap in highly polar compounds, reducing the band-gap percentage error by a factor of 3.
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Affiliation(s)
- Silvana Botti
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
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23
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Bruneval F. Ionization energy of atoms obtained from GW self-energy or from random phase approximation total energies. J Chem Phys 2012; 136:194107. [DOI: 10.1063/1.4718428] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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24
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Tran F. On the accuracy of the non-self-consistent calculation of the electronic structure of solids with hybrid functionals. PHYSICS LETTERS. A 2012; 376:879-882. [PMID: 22368320 PMCID: PMC3280356 DOI: 10.1016/j.physleta.2012.01.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Accepted: 01/16/2012] [Indexed: 05/27/2023]
Abstract
A simple approximation within the framework of the hybrid methods for the calculation of the electronic structure of solids is presented. By considering only the diagonal elements of the matrix of the perturbation operator (Hartree-Fock exchange minus semilocal exchange) calculated in the basis of the semilocal orbitals, the computational time is drastically reduced, while keeping very well in most studied cases the accuracy of the results obtained with hybrid functionals when applied without any approximations.
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25
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Matsuura A, Thrupp N, Gonze X, Pouillon Y, Bruant G, Onida G. The ETSF: An e-Infrastructure That Bridges Simulations and Experiments. Comput Sci Eng 2012. [DOI: 10.1109/mcse.2011.76] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Cortona P, Mebarki M. Cu₂O behavior under pressure: an ab initio study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:045502. [PMID: 21406887 DOI: 10.1088/0953-8984/23/4/045502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have performed density-functional theory calculations for three crystallographic phases (cuprite, CdI(2), and CdCl(2)) of the cuprous oxide by using both the local-density approximation (LDA) and the Perdew-Burke-Ernzerhof generalized-gradient approximation. The latter gives a very good description of the properties of the cuprite phase at room temperature. In particular, the bulk modulus and the elastic constants at zero pressure are in excellent agreement with experiment. At 10 GPa (7 in LDA calculations), the transition from the cuprite to the CdI(2) phase occurs, and the latter remains the phase having the smallest Gibbs energy up to the maximum pressure we have considered (20 GPa). We have also determined the elastic constants of Cu(2)O in the cuprite phase for various applied pressures. The results indicate that this structure becomes unstable with respect to trigonal deformations before the transition to the CdI(2) phase. On the other hand, no indication of instability with respect to tetragonal deformations has been found. This kind of instability would occur at pressures greater than the phase transition pressure.
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Affiliation(s)
- P Cortona
- Laboratoire Structure, Propriétés et Modélisation des Solides, UMR 8580, École Centrale Paris, Grande Voie des Vignes, F-92295 Chatenay-Malabry, France.
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27
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Aguilera I, Palacios P, Sànchez K, Wahnòn P. Advanced Computational Design of Intermediate-Band Photovoltaic Material V-substituted MgIn2S4. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-1218-z04-02] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractAn intermediate-band material based on thiospinel semiconductor MgIn2S4is presented. This material is proposed as high efficiency photovoltaic material for intermediate-band solar cells. We analyze V substitution for In in the parent compound MgIn2S4and the formation of the V d-states intermediate band. For the proper characterization of the width and position of this band inside the band gap, the standardone-shotGW method within the plasmon-pole approximation is applied. The electronic properties thus obtained are discussed and compared to those studied with Density Functional Theory (DFT), and the advantages and the limitations of the two methods are discussed. In addition, DFT electronic-charge density analysis is shown.
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28
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Toroker MC, Kanan DK, Alidoust N, Isseroff LY, Liao P, Carter EA. First principles scheme to evaluate band edge positions in potential transition metal oxide photocatalysts and photoelectrodes. Phys Chem Chem Phys 2011; 13:16644-54. [DOI: 10.1039/c1cp22128k] [Citation(s) in RCA: 308] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Rocca D, Lu D, Galli G. Ab initio calculations of optical absorption spectra: Solution of the Bethe–Salpeter equation within density matrix perturbation theory. J Chem Phys 2010; 133:164109. [DOI: 10.1063/1.3494540] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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30
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Yang F, Sun Q, Ma LL, Jia Y, Luo SJ, Liu JM, Geng WT, Chen JY, Li S, Yu Y. Magnetic Properties of CumOn Clusters: A First Principles Study. J Phys Chem A 2010; 114:8417-22. [DOI: 10.1021/jp103703n] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fan Yang
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - Qiang Sun
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - L. L. Ma
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - Yu Jia
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - S. J. Luo
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - J. M. Liu
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - W. T. Geng
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - J. Y. Chen
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - Sa Li
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
| | - Ying Yu
- Institute of Nanoscience and Nanotechnology, Huazhong Normal University, Wuhan 430079, China, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China, Materials Modeling Laboratory, University of Science and Technology Beijing, Beijing 100083, China, School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China, and Department of Physics, Virginia Commonwealth
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31
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Vidal J, Trani F, Bruneval F, Marques MAL, Botti S. Effects of electronic and lattice polarization on the band structure of delafossite transparent conductive oxides. PHYSICAL REVIEW LETTERS 2010; 104:136401. [PMID: 20481897 DOI: 10.1103/physrevlett.104.136401] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Indexed: 05/29/2023]
Abstract
We use hybrid functionals and restricted self-consistent GW, state-of-the-art theoretical approaches for quasiparticle band structures, to study the electronic states of delafossite Cu(Al,In)O2, the first p-type and bipolar transparent conductive oxides. We show that a self-consistent GW approximation gives remarkably wider band gaps than all the other approaches used so far. Accounting for polaronic effects in the GW scheme we recover a very nice agreement with experiments. Furthermore, the modifications with respect to the Kohn-Sham bands are strongly k dependent, which makes questionable the common practice of using a scissor operator. Finally, our results support the view that the low energy structures found in optical experiments, and initially attributed to an indirect transition, are due to intrinsic defects in the samples.
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Affiliation(s)
- Julien Vidal
- Institute for Research and Development of Photovoltaic Energy, UMR 7174 CNRS/EDF/ENSCP, 6 quai Watier, 78401 Chatou, France
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32
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Vidal J, Botti S, Olsson P, Guillemoles JF, Reining L. Strong interplay between structure and electronic properties in CuIn(S,Se){2}: a first-principles study. PHYSICAL REVIEW LETTERS 2010; 104:056401. [PMID: 20366776 DOI: 10.1103/physrevlett.104.056401] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 12/02/2009] [Indexed: 05/29/2023]
Abstract
We present a first-principles study of the electronic properties of CuIn(S,Se){2} (CIS) using state-of-the-art self-consistent GW and hybrid functionals. The calculated band gap depends strongly on the anion displacement u, an internal structural parameter that measures lattice distortion. This contrasts with the observed stability of the band gap of CIS solar panels under operating conditions, where a relatively large dispersion of values for u occurs. We solve this apparent paradox considering the coupled effect on the band gap of copper vacancies and lattice distortions. The correct treatment of d electrons in these materials requires going beyond density functional theory, and GW self-consistency is critical to evaluate the quasiparticle gap and the valence band maximum.
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Affiliation(s)
- Julien Vidal
- Institute for Research and Development of Photovoltaic Energy (IRDEP), UMR 7174 CNRS/EDF/ENSCP, 6 quai Watier, 78401 Chatou, France
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33
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Cheng G, Hight Walker AR. Transmission electron microscopy characterization of colloidal copper nanoparticles and their chemical reactivity. Anal Bioanal Chem 2009; 396:1057-69. [DOI: 10.1007/s00216-009-3203-0] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2009] [Revised: 09/25/2009] [Accepted: 09/28/2009] [Indexed: 11/30/2022]
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34
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35
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Jiang H, Gomez-Abal RI, Rinke P, Scheffler M. Localized and itinerant states in lanthanide oxides united by GW @ LDA+U. PHYSICAL REVIEW LETTERS 2009; 102:126403. [PMID: 19392301 DOI: 10.1103/physrevlett.102.126403] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2008] [Indexed: 05/27/2023]
Abstract
Many-body perturbation theory in the GW approach is applied to lanthanide oxides, using the local-density approximation plus a Hubbard U correction (LDA+U) as the starting point. Good agreement between the G0W0 density of states and experimental spectra is observed for CeO2 and Ce2O3. Unlike the LDA+U method G0W0 exhibits only a weak dependence on U in a physically meaningful range of U values. For the whole lanthanide sesquioxide (Ln2O3) series G0W0 @ LDA+U reproduces the main features found for the optical experimental band gaps. The relative positions of the occupied and unoccupied f states predicted by G0W0 confirm the experimental conjecture derived from phenomenological arguments.
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Affiliation(s)
- Hong Jiang
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
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36
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French M, Schwartz R, Stolz H, Redmer R. Electronic band structure of Cu(2)O by spin density functional theory. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:015502. [PMID: 21817223 DOI: 10.1088/0953-8984/21/1/015502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The band structure of Cu(2)O is calculated using density functional theory in the generalized gradient approximation. By taking spin-orbit coupling into account the split between the Γ(7)(+) and the Γ(8)(+) valence band states is obtained as 128 meV. The highest valence band shows a noticeable nonparabolicity close to the Γ point. This is important for the quantitative description of excitons in this material, which is considered to be the best candidate for the confirmation that Bose-Einstein condensation also occurs in excitonic systems.
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Affiliation(s)
- M French
- Institut für Physik, Universität Rostock, D-18051 Rostock, Germany
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37
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Gatti M, Bruneval F, Olevano V, Reining L. Understanding correlations in vanadium dioxide from first principles. PHYSICAL REVIEW LETTERS 2007; 99:266402. [PMID: 18233592 DOI: 10.1103/physrevlett.99.266402] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2007] [Indexed: 05/25/2023]
Abstract
Vanadium dioxide is a prototype material for the discussion of correlation effects in solids. First-principles density-functional theory does not describe the metal-insulator transition, whereas strongly correlated models reproduce the main features. Here we present a parameter-free GW calculation of VO2 and show that the correlation effects in the band structure of both the metallic and the insulating phases are correctly reproduced, provided that quasiparticle energies and wave functions are calculated self-consistently. Our calculations explain the satellite in the photoemission spectrum of the metal as due to a plasmon resonance in the energy-loss function and show that this feature disappears in the insulator.
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Affiliation(s)
- Matteo Gatti
- Laboratoire des Solides Irradiés, Ecole Polytechnique, CNRS-CEA/DSM, F-91128 Palaiseau, France
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38
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Sjakste J, Vast N, Tyuterev V. Ab initio method for calculating electron-phonon scattering times in semiconductors: application to GaAs and GaP. PHYSICAL REVIEW LETTERS 2007; 99:236405. [PMID: 18233390 DOI: 10.1103/physrevlett.99.236405] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2007] [Indexed: 05/25/2023]
Abstract
We propose a fully ab initio approach to calculate electron-phonon scattering times for excited electrons interacting with short-wavelength (intervalley) phonons in semiconductors. Our approach is based on density functional perturbation theory and on the direct integration of electronic scattering probabilities over all possible final states with no ad hoc assumptions. We apply it to the deexcitation of hot electrons in GaAs, and calculate the lifetime of the direct exciton in GaP, both in excellent agreement with experiments. Matrix elements of the electron-phonon coupling, and their dependence on the wave vector of the final state and on the phonon modes, are shown to be crucial ingredients of the evaluation of electron-phonon scattering times.
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Affiliation(s)
- Jelena Sjakste
- Ecole Polytechnique, Laboratoire des Solides Irradiés, CEA-DSM, CNRS, 91128 Palaiseau, France
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