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Fang Y, Zhang F, Ye Z, Zhang H, Lu WC, Wu S, Yao YX, Wang CZ, Ho KM. Ground and excited states of even-numbered Hubbard ring at half-filling: comparison of the extended Gutzwiller approach with exact diagonalization. J Phys Condens Matter 2023; 35:265602. [PMID: 36972616 DOI: 10.1088/1361-648x/acc7ed] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 03/27/2023] [Indexed: 06/18/2023]
Abstract
It remains a great challenge in condensed matter physics to develop a method to treat strongly correlated many-body systems with balanced accuracy and efficiency. We introduce an extended Gutzwiller (EG) method incorporating a manifold technique, which builds an effective manifold of the many-body Hilbert space, to describe the ground-state (GS) and excited-state (ES) properties of strongly correlated electrons. We systematically apply an EG projector onto the GS and ES of a non-interacting system. Diagonalization of the true Hamiltonian within the manifold formed by the resulting EG wavefunctions gives the approximate GS and ES of the correlated system. To validate this technique, we implement it on even-numbered fermionic Hubbard rings at half-filling with periodic boundary conditions, and compare the results with the exact diagonalization (ED) method. The EG method is capable of generating high-quality GS and low-lying ES wavefunctions, as evidenced by the high overlaps of wavefunctions between the EG and ED methods. Favorable comparisons are also achieved for other quantities including the total energy, the double occupancy, the total spin and the staggered magnetization. With the capability of accessing the ESs, the EG method can capture the essential features of the one-electron removal spectral function that contains contributions from states deep in the excited spectrum. Finally, we provide an outlook on the application of this method on large extended systems.
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Affiliation(s)
- Yimei Fang
- Department of Physics, OSED, Key Laboratory of Low Dimensional Condensed Matter Physics (Department of Education of Fujian Province), Jiujiang Research institute, Xiamen University, Xiamen 361005, People's Republic of China
| | - Feng Zhang
- Division of Materials Science and Engineering, Ames National Laboratory, Ames, IA 50011, United States of America
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Zhuo Ye
- Division of Materials Science and Engineering, Ames National Laboratory, Ames, IA 50011, United States of America
| | - Han Zhang
- College of Physics, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Wen-Cai Lu
- College of Physics, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Shunqing Wu
- Department of Physics, OSED, Key Laboratory of Low Dimensional Condensed Matter Physics (Department of Education of Fujian Province), Jiujiang Research institute, Xiamen University, Xiamen 361005, People's Republic of China
| | - Yong-Xin Yao
- Division of Materials Science and Engineering, Ames National Laboratory, Ames, IA 50011, United States of America
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Cai-Zhuang Wang
- Division of Materials Science and Engineering, Ames National Laboratory, Ames, IA 50011, United States of America
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Kai-Ming Ho
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
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Kim JR, Sohn B, Lee HJ, Lee S, Ko EK, Hahn S, Lee S, Kim Y, Kim D, Kim HJ, Kim Y, Son J, Ahn CH, Walker FJ, Go A, Kim M, Kim CH, Kim C, Noh TW. Heteroepitaxial Control of Fermi Liquid, Hund Metal, and Mott Insulator Phases in Single-Atomic-Layer Ruthenates. Adv Mater 2023; 35:e2208833. [PMID: 36739615 DOI: 10.1002/adma.202208833] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 01/08/2023] [Indexed: 06/18/2023]
Abstract
Interfaces between dissimilar correlated oxides can offer devices with versatile functionalities, and great efforts have been made to manipulate interfacial electronic phases. However, realizing such phases is often hampered by the inability to directly access the electronic structure information; most correlated interfacial phenomena appear within a few atomic layers from the interface. Here, atomic-scale epitaxy and photoemission spectroscopy are utilized to realize the interface control of correlated electronic phases in atomic-scale ruthenate-titanate heterostructures. While bulk SrRuO3 is a ferromagnetic metal, the heterointerfaces exclusively generate three distinct correlated phases in the single-atomic-layer limit. The theoretical analysis reveals that atomic-scale structural proximity effects yield Fermi liquid, Hund metal, and Mott insulator phases in the quantum-confined SrRuO3 . These results highlight the extensive interfacial tunability of electronic phases, hitherto hidden in the atomically thin correlated heterostructure. Moreover, this experimental platform suggests a way to control interfacial electronic phases of various correlated materials.
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Affiliation(s)
- Jeong Rae Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Byungmin Sohn
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
- Department of Applied Physics, Yale University, New Haven, CT, 06520, USA
| | - Hyeong Jun Lee
- Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon, 34126, South Korea
| | - Sangmin Lee
- Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, South Korea
| | - Eun Kyo Ko
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Sungsoo Hahn
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Sangjae Lee
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
| | - Younsik Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Donghan Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Hong Joon Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Youngdo Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Jaeseok Son
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Charles H Ahn
- Department of Applied Physics, Yale University, New Haven, CT, 06520, USA
- Department of Physics, Yale University, New Haven, CT, 06520, USA
| | - Frederick J Walker
- Department of Applied Physics, Yale University, New Haven, CT, 06520, USA
| | - Ara Go
- Department of Physics, Chonnam National University, Gwangju, 61186, South Korea
| | - Miyoung Kim
- Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, South Korea
| | - Choong H Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Changyoung Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
| | - Tae Won Noh
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, South Korea
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea
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Ali A, Reddy BH, Singh RS. Evidence of electron correlation and weak bulk plasmon in SrMoO 3. J Phys Condens Matter 2023; 35:11LT01. [PMID: 36599167 DOI: 10.1088/1361-648x/acb031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
We investigate the electronic structure of highly conducting perovskite SrMoO3using valence band photoemission spectroscopy and electronic structure calculations. Large intensity corresponding to coherent feature close to Fermi level is captured by density functional theory (DFT) calculation. An additional satellite at ∼3 eV binding energy remains absent in DFT, hybrid functional (DFT-hybrid) and dynamical mean field theory (DFT + DMFT) calculations. Mo 4dspectra obtained with different surface sensitive photoemission spectroscopy suggest different surface and bulk electronic structures. DFT + DMFT spectral function is in excellent agreement with the coherent feature in the bulk Mo 4dspectra, revealing moderate electron correlation strength. A large plasmon satellite and signature of strong electron correlation are observed in the surface spectra, while the bulk spectra exhibits aweakplasmon satellite.
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Affiliation(s)
- Asif Ali
- Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, India
| | - B H Reddy
- Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, India
| | - Ravi Shankar Singh
- Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, India
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Butler CJ, Kohsaka Y, Yamakawa Y, Bahramy MS, Onari S, Kontani H, Hanaguri T, Shamoto S. Correlation-driven electronic nematicity in the Dirac semimetal BaNiS(2). Proc Natl Acad Sci U S A 2022; 119:e2212730119. [PMID: 36459647 DOI: 10.1073/pnas.2212730119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
In BaNiS2, a Dirac nodal line band structure exists within a two-dimensional Ni square lattice system, in which significant electronic correlation effects are anticipated. Using scanning tunneling microscopy (STM), we discover signs of correlated-electron behavior, namely electronic nematicity appearing as a pair of C2-symmetry striped patterns in the local density-of-states at ∼60 meV above the Fermi energy. In observations of quasiparticle interference, as well as identifying scattering between Dirac cones, we find that the striped patterns in real space stem from a lifting of degeneracy among electron pockets at the Brillouin zone boundary. We infer a momentum-dependent energy shift with d-form factor, which we model numerically within a density wave (DW) equation framework that considers spin-fluctuation-driven nematicity. This suggests an unusual mechanism driving the nematic instability, stemming from only a small perturbation to the Fermi surface, in a system with very low density of states at the Fermi energy. The Dirac points lie at nodes of the d-form factor and are almost unaffected by it. These results highlight BaNiS2 as a unique material in which Dirac electrons and symmetry-breaking electronic correlations coexist.
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Ye Z, Zhang F, Fang Y, Zhang H, Wu S, Lu WC, Yao YX, Wang CZ, Ho KM. A rotationally invariant approach based on Gutzwiller wave function for correlated electron systems. J Phys Condens Matter 2022; 34:495601. [PMID: 36220012 DOI: 10.1088/1361-648x/ac9945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
We introduce a rotationally invariant approach combined with the Gutzwiller conjugate gradient minimization method to study correlated electron systems. In the approach, the Gutzwiller projector is parametrized based on the number of electrons occupying the onsite orbitals instead of the onsite configurations. The approach efficiently groups the onsite orbitals according to their symmetry and greatly reduces the computational complexity, which yields a speedup of20∼50×in the minimal basis energy calculation of dimers. The computationally efficient approach promotes more accurate calculations beyond the minimal basis that is inapplicable in the original approach. A large-basis energy calculation of F2demonstrates favorable agreements with standard quantum-chemical calculations Bytautaset al(2007J. Chem. Phys.127164317).
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Affiliation(s)
- Zhuo Ye
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Feng Zhang
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Yimei Fang
- Department of Physics, OSED, Key Laboratory of Low Dimensional Condensed Matter Physics Department of Education of Fujian Province Jiujiang Research Institute, Xiamen University, Xiamen 361005, People's Republic of China
| | - Han Zhang
- College of Physics, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Shunqing Wu
- Department of Physics, OSED, Key Laboratory of Low Dimensional Condensed Matter Physics Department of Education of Fujian Province Jiujiang Research Institute, Xiamen University, Xiamen 361005, People's Republic of China
| | - Wen-Cai Lu
- College of Physics, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Yong-Xin Yao
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Cai-Zhuang Wang
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Kai-Ming Ho
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
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Ye Z, Fang Y, Zhang H, Zhang F, Wu S, Lu WC, Yao YX, Wang CZ, Ho KM. The Gutzwiller conjugate gradient minimization method for correlated electron systems. J Phys Condens Matter 2022; 34:243001. [PMID: 35290968 DOI: 10.1088/1361-648x/ac5e03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
We review our recent work on the Gutzwiller conjugate gradient minimization method, anab initioapproach developed for correlated electron systems. The complete formalism has been outlined that allows for a systematic understanding of the method, followed by a discussion of benchmark studies of dimers, one- and two-dimensional single-band Hubbard models. In the end, we present some preliminary results of multi-band Hubbard models and large-basis calculations of F2to illustrate our efforts to further reduce the computational complexity.
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Affiliation(s)
- Zhuo Ye
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States of America
| | - Yimei Fang
- Department of Physics, OSED, Key Laboratory of Low Dimensional Condensed Matter Physics, (Department of Education of Fujian Province) Jiujiang Research Institute, Xiamen University, Xiamen 361005, People's Republic of China
| | - Han Zhang
- College of Physics, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Feng Zhang
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States of America
| | - Shunqing Wu
- Department of Physics, OSED, Key Laboratory of Low Dimensional Condensed Matter Physics, (Department of Education of Fujian Province) Jiujiang Research Institute, Xiamen University, Xiamen 361005, People's Republic of China
| | - Wen-Cai Lu
- College of Physics, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Yong-Xin Yao
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States of America
| | - Cai-Zhuang Wang
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States of America
| | - Kai-Ming Ho
- Ames Laboratory-US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States of America
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Khare A, Kumar KS, S DK, P A, Rana DS. Terahertz spectroscopic evidence of electron correlations in SrVO 3epitaxial thin films. J Phys Condens Matter 2021; 33:425602. [PMID: 34284355 DOI: 10.1088/1361-648x/ac1621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
Electron correlation in transition metal oxides (TMOs) is an intriguing topic in condensed matter physics, revealing a wide variety of exotic physical properties. Investigating low-energy carrier dynamics by terahertz (THz) spectroscopy is an efficient route to obtain the essential insights into electron correlation. In the present study, THz-time-domain spectroscopy is employed to probe electron correlation in SrVO3epitaxial thin films. The low energy carrier dynamics of SrVO3in the range of 0.2-6.0 meV shows a typical metallic behavior as overserved in dc transport measurements. The obtained temperature-dependent optical parameters provide evidence of mass renormalization in the low energy regime and carrier momentum relaxation happens via the electron-electron scattering mechanism. Overall, the frequency and temperature-dependent optical parameters indicate the Fermi liquid ground state in a Mott-Hubbard type correlated metal SrVO3thin film. Our results provide significant insight on low energy carrier dynamics in the correlated electron system, particularly perovskite-basedd1TMOs.
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Affiliation(s)
- Amit Khare
- Department of Physics, Indian Institute of Science Education and Research (IISER), Bhopal 462 066, India
| | - K Santhosh Kumar
- Department of Physics, Indian Institute of Science Education and Research (IISER), Bhopal 462 066, India
| | - Dinesh Kumar S
- Department of Physics, Indian Institute of Science Education and Research (IISER), Bhopal 462 066, India
| | - Anagha P
- Department of Physics, Indian Institute of Science Education and Research (IISER), Bhopal 462 066, India
| | - D S Rana
- Department of Physics, Indian Institute of Science Education and Research (IISER), Bhopal 462 066, India
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Rossi M, Henriquet C, Jacobs J, Donnerer C, Boseggia S, Al-Zein A, Fumagalli R, Yao Y, Vale JG, Hunter EC, Perry RS, Kantor I, Garbarino G, Crichton W, Monaco G, McMorrow DF, Krisch M, Moretti Sala M. Resonant inelastic X-ray scattering of magnetic excitations under pressure. J Synchrotron Radiat 2019; 26:1725-1732. [PMID: 31490164 DOI: 10.1107/s1600577519008877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 06/21/2019] [Indexed: 06/10/2023]
Abstract
Resonant inelastic X-ray scattering (RIXS) is an extremely valuable tool for the study of elementary, including magnetic, excitations in matter. The latest developments of this technique have mostly been aimed at improving the energy resolution and performing polarization analysis of the scattered radiation, with a great impact on the interpretation and applicability of RIXS. Instead, this article focuses on the sample environment and presents a setup for high-pressure low-temperature RIXS measurements of low-energy excitations. The feasibility of these experiments is proved by probing the magnetic excitations of the bilayer iridate Sr3Ir2O7 at pressures up to 12 GPa.
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Affiliation(s)
- Matteo Rossi
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Christian Henriquet
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Jeroen Jacobs
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Christian Donnerer
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
| | - Stefano Boseggia
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
| | - Ali Al-Zein
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Roberto Fumagalli
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Yi Yao
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - James G Vale
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
| | - Emily C Hunter
- Centre for Science at Extreme Conditions, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, UK
| | - Robin S Perry
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
| | - Innokenty Kantor
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Gaston Garbarino
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Wilson Crichton
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Giulio Monaco
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Desmond F McMorrow
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
| | - Michael Krisch
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
| | - Marco Moretti Sala
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France
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