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Akama H, Kojima KM, McKenzie I, Ito S. Producing Conventional and Transient Amino(mercapto)methyl Radicals by Addition of Muonium to a Crystalline Thioformamide (Mes*NHCH=S). Chemphyschem 2024:e202300980. [PMID: 38515308 DOI: 10.1002/cphc.202300980] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/21/2024] [Accepted: 03/21/2024] [Indexed: 03/23/2024]
Abstract
Muonium (Mu=μ+e-) is composed of a muon of light isotope of proton (μ+) and electron (e-) and can be used as a light surrogate for a hydrogen atom. In this paper, we investigated addition of muonium to a newly synthesized Mes*-substituted thioformamide (Mes*NHCH=S, Mes*=2,4,6-tBu3C6H2). Transverse-field muon spin rotation (TF-μSR) of a solution sample of the thioformamide confirmed addition of muonium to the sulfur atom leading to the corresponding C-centered radical [Mes*NHC(H)⋅-SMu]. Density functional theory (DFT) calculations assigned a conventional amino(mercapto)methyl radical, in which both nitrogen and carbon were slightly pyramidalized, and the calculated muon hyperfine coupling constant (hfcc) including the muon isotope effect was compatible with the experimentally determined parameter. However, the muon level-crossing resonance (μLCR) spectrum of an anisotropic crystalline sample indicated two paramagnetic species, and the major product showed the considerably larger muon hfcc compared with the conventional structure of the amino(mercapto)methyl radical. The unusual transient muoniated thioformamide with the larger muon hfcc that showed rapid relaxation could be only explained by a transient structure including planarization of the nitrogen and carbon atoms in Mes*NHC(H)⋅-SMu.
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Affiliation(s)
- Hikaru Akama
- Department of Applied Chemistry, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-H113 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Kenji M Kojima
- Centre for Molecular and Materials Science, TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
| | - Iain McKenzie
- Centre for Molecular and Materials Science, TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
| | - Shigekazu Ito
- Department of Applied Chemistry, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-H113 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
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2
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Cahaya AB, Leon AO, Fauzi MH. Spin-orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions. Nanotechnology 2023; 34:505001. [PMID: 37708861 DOI: 10.1088/1361-6528/acf9ac] [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: 05/19/2023] [Accepted: 09/14/2023] [Indexed: 09/16/2023]
Abstract
Spin-transfer and spin-orbit torques allow controlling magnetic degrees of freedom in various materials and devices. However, while the transfer of angular momenta between electrons has been widely studied, the contribution of nuclear spins has yet to be explored further. This article demonstrates that the hyperfine coupling, which consists of Fermi contact and dipolar interactions, can mediate the application of spin-orbit torques acting on nuclear spins. Our starting point is a sizable nuclear spin in a metal with electronic spin accumulation. Then, via the hyperfine interactions, the nuclear spin modifies the an electronic spin density. The reactions to the equilibrium and nonequilibrium components of the spin density is a torque on the nucleus with field-like and damping-like components, respectively. Thisnuclearspin-orbittorqueis a step toward stabilizing and controlling nuclear magnetic momenta, in magnitude and direction, and realizing nuclear spintronics.
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Affiliation(s)
- Adam B Cahaya
- Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia
- Research Center for Quantum Physics, National Research and Innovation Agency, South Tangerang, Banten, 15314, Indonesia
| | - Alejandro O Leon
- Departamento de Física, Facultad de Ciencias Naturales, Matemática y del Medio Ambiente, Universidad Tecnológica Metropolitana, Las Palmeras 3360, Ñuñoa 780-0003, Santiago, Chile
| | - Mohammad H Fauzi
- Research Center for Quantum Physics, National Research and Innovation Agency, South Tangerang, Banten, 15314, Indonesia
- Research Collaboration Center for Quantum Technology 2.0, Bandung 40132, Indonesia
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3
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Harkort C, Kudlacik D, Kopteva NE, Yakovlev DR, Karzel M, Kirstein E, Hordiichuk O, Kovalenko MV, Bayer M. Spin-Flip Raman Scattering on Electrons and Holes in Two-Dimensional (PEA) 2 PbI 4 Perovskites. Small 2023; 19:e2300988. [PMID: 37066731 DOI: 10.1002/smll.202300988] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/14/2023] [Indexed: 06/19/2023]
Abstract
The class of Ruddlesden-Popper type (PEA)2 PbI4 perovskites comprises 2D structures whose optical properties are determined by excitons with a large binding energy of about 260 meV. It complements the family of other 2D semiconductor materials by having the band structure typical for lead halide perovskites, that can be considered as inverted compared to conventional III-V and II-VI semiconductors. Accordingly, novel spin phenomena can be expected for them. Spin-flip Raman scattering is used here to measure the Zeeman splitting of electrons and holes in a magnetic field up to 10 T. From the recorded data, the electron and hole Landé factors (g-factors) are evaluated, their signs are determined, and their anisotropies are measured. The electron g-factor value changes from +2.11 out-of-plane to +2.50 in-plane, while the hole g-factor ranges between -0.13 and -0.51. The spin flips of the resident carriers are arranged via their interaction with photogenerated excitons. Also the double spin-flip process, where a resident electron and a resident hole interact with the same exciton, is observed showing a cumulative Raman shift. Dynamic nuclear spin polarization induced by spin-polarized holes is detected in corresponding changes of the hole Zeeman splitting. An Overhauser field of the polarized nuclei acting on the holes as large as 0.6 T can be achieved.
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Affiliation(s)
- Carolin Harkort
- Experimentelle Physik 2, Technische Universität Dortmund, D-44227, Dortmund, Germany
| | - Dennis Kudlacik
- Experimentelle Physik 2, Technische Universität Dortmund, D-44227, Dortmund, Germany
| | - Natalia E Kopteva
- Experimentelle Physik 2, Technische Universität Dortmund, D-44227, Dortmund, Germany
| | - Dmitri R Yakovlev
- Experimentelle Physik 2, Technische Universität Dortmund, D-44227, Dortmund, Germany
| | - Marek Karzel
- Experimentelle Physik 2, Technische Universität Dortmund, D-44227, Dortmund, Germany
| | - Erik Kirstein
- Experimentelle Physik 2, Technische Universität Dortmund, D-44227, Dortmund, Germany
| | - Oleh Hordiichuk
- Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093, Zürich, Switzerland
- Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600, Dübendorf, Switzerland
| | - Maksym V Kovalenko
- Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093, Zürich, Switzerland
- Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600, Dübendorf, Switzerland
| | - Manfred Bayer
- Experimentelle Physik 2, Technische Universität Dortmund, D-44227, Dortmund, Germany
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4
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Leberecht B, Wong SY, Satish B, Döge S, Hindman J, Venkatraman L, Apte S, Haase K, Musielak I, Dautaj G, Solov'yov IA, Winklhofer M, Mouritsen H, Hore PJ. Upper bound for broadband radiofrequency field disruption of magnetic compass orientation in night-migratory songbirds. Proc Natl Acad Sci U S A 2023; 120:e2301153120. [PMID: 37399422 DOI: 10.1073/pnas.2301153120] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 04/17/2023] [Indexed: 07/05/2023] Open
Abstract
Night-migratory songbirds have a light-dependent magnetic compass sense, the mechanism of which is thought to depend on the photochemical formation of radical pairs in cryptochrome (Cry) proteins located in the retina. The finding that weak radiofrequency (RF) electromagnetic fields can prevent birds from orienting in the Earth's magnetic field has been regarded as a diagnostic test for this mechanism and as a potential source of information on the identities of the radicals. The maximum frequency that could cause such disorientation has been predicted to lie between 120 and 220 MHz for a flavin-tryptophan radical pair in Cry. Here we show that the magnetic orientation capabilities of Eurasian blackcaps (Sylvia atricapilla) are not affected by RF noise in the frequency bands 140 to 150 MHz and 235 to 245 MHz. From a consideration of its internal magnetic interactions, we argue that RF field effects on a flavin-containing radical-pair sensor should be approximately independent of frequency up to 116 MHz and that birds' sensitivity to RF disorientation should fall by about two orders of magnitude when the frequency exceeds 116 MHz. Taken together with our earlier finding that 75 to 85 MHz RF fields disrupt the magnetic orientation of blackcaps, these results provide compelling evidence that the magnetic compass of migratory birds operates by a radical pair mechanism.
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Affiliation(s)
- Bo Leberecht
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Siu Ying Wong
- Department V - School of Mathematics and Science, Institute of Physics, Carl von Ossietzky Universität Oldenburg, Oldenburg 26111, Germany
| | - Baladev Satish
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Sara Döge
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Jakob Hindman
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Lalitha Venkatraman
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Shambhavi Apte
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Katrin Haase
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Isabelle Musielak
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Glen Dautaj
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
| | - Ilia A Solov'yov
- Department V - School of Mathematics and Science, Institute of Physics, Carl von Ossietzky Universität Oldenburg, Oldenburg 26111, Germany
- Research Center Neurosensory Science, University of Oldenburg, Oldenburg 26111, Germany
| | - Michael Winklhofer
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
- Research Center Neurosensory Science, University of Oldenburg, Oldenburg 26111, Germany
| | - Henrik Mouritsen
- Department V - School of Mathematics and Science, Institute of Biology and Environmental Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg 26129, Germany
- Research Center Neurosensory Science, University of Oldenburg, Oldenburg 26111, Germany
| | - P J Hore
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, Oxford OX1 3QZ, United Kingdom
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5
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Shamirzaev TS, Shumilin AV, Smirnov DS, Kudlacik D, Nekrasov SV, Kusrayev YG, Yakovlev DR, Bayer M. Optical Orientation of Excitons in a Longitudinal Magnetic Field in Indirect-Band-Gap (In,Al)As/AlAs Quantum Dots with Type-I Band Alignment. Nanomaterials (Basel) 2023; 13:729. [PMID: 36839097 PMCID: PMC9963670 DOI: 10.3390/nano13040729] [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] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/06/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
Exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots (QDs) with indirect band gap and type-I band alignment were studied. The negligible (less than 0.2 μeV) value of the anisotropic exchange interaction in these QDs prevents the mixing of the excitonic basis states and makes the formation of spin-polarized bright excitons possible under quasi-resonant, circularly polarized excitation. The recombination and spin dynamics of excitons are controlled by the hyperfine interaction between the electron and nuclear spins. A QD blockade by dark excitons was observed in the magnetic field, that eliminates the impact of nuclear spin fluctuations. A kinetic model which accounts for the population dynamics of the bright and dark exciton states as well as for the spin dynamics was developed to quantitatively describe the experimental data.
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Affiliation(s)
- T. S. Shamirzaev
- Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - A. V. Shumilin
- Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
| | - D. S. Smirnov
- Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
| | - D. Kudlacik
- Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - S. V. Nekrasov
- Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
| | - Yu G. Kusrayev
- Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
| | - D. R. Yakovlev
- Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
- Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - M. Bayer
- Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany
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6
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Stass DV. Geometrization for Energy Levels of Isotropic Hyperfine Hamiltonian Block and Related Central Spin Problems for an Arbitrarily Complex Set of Spin-1/2 Nuclei. Int J Mol Sci 2022; 23. [PMID: 36499535 DOI: 10.3390/ijms232315199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/20/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022] Open
Abstract
Description of interacting spin systems relies on understanding the spectral properties of the corresponding spin Hamiltonians. However, the eigenvalue problems arising here lead to algebraic problems too complex to be analytically tractable. This is already the case for the simplest nontrivial (Kmax−1) block for an isotropic hyperfine Hamiltonian for a radical with spin-12 nuclei, where n nuclei produce an n-th order algebraic equation with n independent parameters. Systems described by such blocks are now physically realizable, e.g., as radicals or radical pairs with polarized nuclear spins, appear as closed subensembles in more general radical settings, and have numerous counterparts in related central spin problems. We provide a simple geometrization of energy levels in this case: given n spin-12 nuclei with arbitrary positive couplings ai, take an n-dimensional hyper-ellipsoid with semiaxes ai, stretch it by a factor of n+1 along the spatial diagonal (1, 1, …, 1), read off the semiaxes of thus produced new hyper-ellipsoid qi, augment the set {qi} with q0=0, and obtain the sought n+1 energies as Ek=−12qk2+14∑iai. This procedure provides a way of seeing things that can only be solved numerically, giving a useful tool to gain insights that complement the numeric simulations usually inevitable here, and shows an intriguing connection to discrete Fourier transform and spectral properties of standard graphs.
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7
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Farinacci L, Veldman LM, Willke P, Otte S. Experimental Determination of a Single Atom Ground State Orbital through Hyperfine Anisotropy. Nano Lett 2022; 22:8470-8474. [PMID: 36305860 PMCID: PMC9650725 DOI: 10.1021/acs.nanolett.2c02783] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Historically, electron spin resonance (ESR) has provided excellent insight into the electronic, magnetic, and chemical structure of samples hosting spin centers. In particular, the hyperfine interaction between the electron and the nuclear spins yields valuable structural information about these centers. In recent years, the combination of ESR and scanning tunneling microscopy (ESR-STM) has allowed to acquire such information about individual spin centers of magnetic atoms bound atop a surface, while additionally providing spatial information about the binding site. Here, we conduct a full angle-dependent investigation of the hyperfine splitting for individual hydrogenated titanium atoms on MgO/Ag(001) by measurements in a vector magnetic field. We observe strong anisotropy in both the g factor and the hyperfine tensor. Combining the results of the hyperfine splitting with the symmetry properties of the binding site obtained from STM images and a basic point charge model allows us to predict the shape of the electronic ground state configuration of the titanium atom. Relying on experimental values only, this method paves the way for a new protocol for electronic structure analysis for spin centers on surfaces.
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Affiliation(s)
- Laëtitia Farinacci
- Department
of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJDelft, The Netherlands
| | - Lukas M. Veldman
- Department
of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJDelft, The Netherlands
| | - Philip Willke
- Physikalisches
Institut, Karlsruhe Institute of Technology, 76131Karlsruhe, Germany
| | - Sander Otte
- Department
of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJDelft, The Netherlands
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8
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Shehada S, Dos Santos Dias M, Abusaa M, Lounis S. Interplay of magnetic states and hyperfine fields of iron dimers on MgO(001). J Phys Condens Matter 2022; 34:385802. [PMID: 35835084 DOI: 10.1088/1361-648x/ac8135] [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: 05/17/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
Individual nuclear spin states can have very long lifetimes and could be useful as qubits. Progress in this direction was achieved on MgO/Ag(001) via detection of the hyperfine interaction (HFI) of Fe, Ti and Cu adatoms using scanning tunneling microscopy. Previously, we systematically quantified from first-principles the HFI for the whole series of 3d transition adatoms (Sc-Cu) deposited on various ultra-thin insulators, establishing the trends of the computed HFI with respect to the filling of the magnetic s- and d-orbitals of the adatoms and on the bonding with the substrate. Here we explore the case of dimers by investigating the correlation between the HFI and the magnetic state of free standing Fe dimers, single Fe adatoms and dimers deposited on a bilayer of MgO(001). We find that the magnitude of the HFI can be controlled by switching the magnetic state of the dimers. For short Fe-Fe distances, the antiferromagnetic state enhances the HFI with respect to that of the ferromagnetic state. By increasing the distance between the magnetic atoms, a transition toward the opposite behavior is observed. Furthermore, we demonstrate the ability to substantially modify the HFI by atomic control of the location of the adatoms on the substrate. Our results establish the limits of applicability of the usual hyperfine hamiltonian and we propose an extension based on multiple scattering processes.
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Affiliation(s)
- Sufyan Shehada
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany
- Department of Physics, RWTH Aachen University, 52056 Aachen, Germany
- Department of Physics, Arab American University, Jenin, Palestine
| | - Manuel Dos Santos Dias
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany
- Faculty of Physics, University of Duisburg-Essen & CENIDE, 47053 Duisburg, Germany
| | - Muayad Abusaa
- Department of Physics, Arab American University, Jenin, Palestine
| | - Samir Lounis
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany
- Faculty of Physics, University of Duisburg-Essen & CENIDE, 47053 Duisburg, Germany
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9
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Pappas WJ, Geng R, Mena A, Baldacchino AJ, Asadpoordarvish A, McCamey DR. Resolving the Spatial Variation and Correlation of Hyperfine Spin Properties in Organic Light-Emitting Diodes. Adv Mater 2022; 34:e2104186. [PMID: 34919299 DOI: 10.1002/adma.202104186] [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: 06/01/2021] [Revised: 12/07/2021] [Indexed: 06/14/2023]
Abstract
Devices that exploit the quantum properties of materials are widespread, with quantum information processors and quantum sensors showing significant progress. Organic materials offer interesting opportunities for quantum technologies owing to their engineerable spin properties, with spintronic operation and spin resonance magnetic-field sensing demonstrated in research grade devices, as well as proven compatibility with large-scale fabrication techniques. Yet several important challenges remain as moving toward scaling these proof-of-principle quantum devices to larger integrated logic systems or spatially smaller sensing elements, particularly those associated with the variation of quantum properties both within and between devices. Here, spatially resolved magnetoluminescence is used to provide the first 2D map of a hyperfine spin property-the Overhauser field-in traditional organic light-emitting diodes (OLEDs). Intra-device variabilities are found to exceed ≈30% while spatially correlated behavior is exhibited on lengths beyond 7 µm, similar in size to pixels in state-of-the-art active-matrix OLED arrays, which has implications for the reproducibility and integration of organic quantum devices.
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Affiliation(s)
- William J Pappas
- ARC Centre of Excellence in Exciton Science, School of Physics, UNSW Sydney, NSW, 2052, Australia
| | - Rugang Geng
- ARC Centre of Excellence in Exciton Science, School of Physics, UNSW Sydney, NSW, 2052, Australia
| | - Adrian Mena
- ARC Centre of Excellence in Exciton Science, School of Physics, UNSW Sydney, NSW, 2052, Australia
| | - Alexander J Baldacchino
- ARC Centre of Excellence in Exciton Science, School of Physics, UNSW Sydney, NSW, 2052, Australia
| | - Amir Asadpoordarvish
- ARC Centre of Excellence in Exciton Science, School of Physics, UNSW Sydney, NSW, 2052, Australia
| | - Dane R McCamey
- ARC Centre of Excellence in Exciton Science, School of Physics, UNSW Sydney, NSW, 2052, Australia
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10
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Kirstein E, Yakovlev DR, Glazov MM, Evers E, Zhukov EA, Belykh VV, Kopteva NE, Kudlacik D, Nazarenko O, Dirin DN, Kovalenko MV, Bayer M. Lead-Dominated Hyperfine Interaction Impacting the Carrier Spin Dynamics in Halide Perovskites. Adv Mater 2022; 34:e2105263. [PMID: 34606138 DOI: 10.1002/adma.202105263] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 09/13/2021] [Indexed: 06/13/2023]
Abstract
The outstanding optical quality of lead halide perovskites inspires studies of their potential for the optical control of carrier spins as pursued in other materials. Entering largely uncharted territory, time-resolved pump-probe Kerr rotation is used to explore the coherent spin dynamics of electrons and holes in bulk formamidinium caesium lead iodine bromide (FA0.9 Cs0.1 PbI2.8 Br0.2 ) and to determine key parameters characterizing interactions of their spins, such as the g-factors and relaxation times. The demonstrated long spin dynamics and narrow g-factor distribution prove the perovskites as promising competitors for conventional semiconductors in spintronics. The dynamic nuclear polarization via spin-oriented holes is realized and the identification of the lead (207 Pb) isotope in optically detected nuclear magnetic resonance proves that the hole-nuclei interaction is dominated by the lead ions. A detailed theoretical analysis accounting for the specifics of the lead halide perovskite materials allows the evaluation of the underlying hyperfine interaction constants, both for electrons and holes. Recombination and spin dynamics evidence that at low temperatures, photogenerated electrons and holes are localized at different regions of the perovskite crystal, resulting in their long lifetimes up to 44 μs. The findings form the base for the tailored development of spin-optoelectronic applications for the large family of lead halide perovskites and their nanostructures.
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Affiliation(s)
- Erik Kirstein
- Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany
| | - Dmitri R Yakovlev
- Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany
- Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia
- P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, 119991, Russia
| | - Mikhail M Glazov
- Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia
| | - Eiko Evers
- Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany
| | - Evgeny A Zhukov
- Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany
- Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia
| | - Vasilii V Belykh
- Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany
| | - Nataliia E Kopteva
- Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany
| | - Dennis Kudlacik
- Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany
| | - Olga Nazarenko
- Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, CH-8093, Switzerland
| | - Dmitry N Dirin
- Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, CH-8093, Switzerland
| | - Maksym V Kovalenko
- Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, CH-8093, Switzerland
- Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, CH-8600, Switzerland
| | - Manfred Bayer
- Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany
- Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia
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11
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Liu Y, Ho LTA, Huang GZ, Chen YC, Ungur L, Liu JL, Tong ML. Magnetization Dynamics on Isotope-Isomorphic Holmium Single-Molecule Magnets. Angew Chem Int Ed Engl 2021; 60:27282-27287. [PMID: 34668633 DOI: 10.1002/anie.202112764] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 10/16/2021] [Indexed: 11/08/2022]
Abstract
Here we reported the deuteration of the metal-binding equatorial water molecules in a reported HoIII single-molecule magnet (SMM) with pentagonal-bipyramidal geometry, from [Ho(CyPh2 PO)2 (H2 O)5 ]3+ to [Ho(CyPh2 PO)2 (D2 O)5 ]3+ . The hyperfine structures originating from the nuclear spin of 165 HoIII can be clearly observed. Moreover, the resulting magnetization dynamics revealed the switch of the relative relaxation rates for the two isotope-isomorphic complexes-respectively faster/slower at low/high temperature. The noticeable isotope effect arises from not only the paramagnetic metal center but also the diamagnetic ligands, which can be explained by the ab initio calculated tunnel splitting and the involvement of the super-hyperfine interaction related to the difference in the nuclear spin number of protium (1 H, I=1 /2 ) and deuterium (2 H, I=1).
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Affiliation(s)
- Yang Liu
- Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, P. R. China
| | - Le Tuan Anh Ho
- Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore
| | - Guo-Zhang Huang
- Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, P. R. China
| | - Yan-Cong Chen
- Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, P. R. China
| | - Liviu Ungur
- Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore
| | - Jun-Liang Liu
- Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, P. R. China
| | - Ming-Liang Tong
- Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, P. R. China
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12
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Nizovtsev AP, Pushkarchuk AL, Kilin SY, Kargin NI, Gusev AS, Smirnova MO, Jelezko F. Hyperfine Interactions in the NV- 13C Quantum Registers in Diamond Grown from the Azaadamantane Seed. Nanomaterials (Basel) 2021; 11:1303. [PMID: 34069205 PMCID: PMC8156205 DOI: 10.3390/nano11051303] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/06/2021] [Accepted: 05/07/2021] [Indexed: 11/17/2022]
Abstract
Nanostructured diamonds hosting optically active paramagnetic color centers (NV, SiV, GeV, etc.) and hyperfine-coupled with them quantum memory 13C nuclear spins situated in diamond lattice are currently of great interest to implement emerging quantum technologies (quantum information processing, quantum sensing and metrology). Current methods of creation such as electronic-nuclear spin systems are inherently probabilistic with respect to mutual location of color center electronic spin and 13C nuclear spins. A new bottom-up approach to fabricate such systems is to synthesize first chemically appropriate diamond-like organic molecules containing desired isotopic constituents in definite positions and then use them as a seed for diamond growth to produce macroscopic diamonds, subsequently creating vacancy-related color centers in them. In particular, diamonds incorporating coupled NV-13C spin systems (quantum registers) with specific mutual arrangements of NV and 13C can be obtained from anisotopic azaadamantane molecule. Here we predict the characteristics of hyperfine interactions (hfi) for the NV-13C systems in diamonds grown from various isotopically substituted azaadamantane molecules differing in 13C position in the seed, as well as the orientation of the NV center in the post-obtained diamond. We used the spatial and hfi data simulated earlier for the H-terminated cluster C510[NV]-H252. The data obtained can be used to identify (and correlate with the seed used) the specific NV-13C spin system by measuring, e.g., the hfi-induced splitting of the mS = ±1 sublevels of the NV center in optically detected magnetic resonance (ODMR) spectra being characteristic for various NV-13C systems.
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Affiliation(s)
- Alexander P. Nizovtsev
- National Research Nuclear University “MEPhI”, 115409 Moscow, Russia; (A.L.P.); (N.I.K.); (A.S.G.); (M.O.S.)
| | - Aliaksandr L. Pushkarchuk
- National Research Nuclear University “MEPhI”, 115409 Moscow, Russia; (A.L.P.); (N.I.K.); (A.S.G.); (M.O.S.)
| | - Sergei Ya. Kilin
- Institute of Physics, Nat. Acad. Sci. of Belarus, 220072 Minsk, Belarus;
| | - Nikolai I. Kargin
- National Research Nuclear University “MEPhI”, 115409 Moscow, Russia; (A.L.P.); (N.I.K.); (A.S.G.); (M.O.S.)
| | - Alexander S. Gusev
- National Research Nuclear University “MEPhI”, 115409 Moscow, Russia; (A.L.P.); (N.I.K.); (A.S.G.); (M.O.S.)
| | - Marina O. Smirnova
- National Research Nuclear University “MEPhI”, 115409 Moscow, Russia; (A.L.P.); (N.I.K.); (A.S.G.); (M.O.S.)
| | - Fedor Jelezko
- Institute for Quantum Optics, Ulm University, 89069 Ulm, Germany;
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13
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Abstract
This review article focuses on the understanding of intersystem crossing (ISC) in molecules. It addresses readers who are interested in the phenomenon of intercombination transitions between states of different electron spin multiplicities but are not familiar with relativistic quantum chemistry. Among the spin-dependent interaction terms that enable a crossover between states of different electron spin multiplicities, spin-orbit coupling (SOC) is by far the most important. If SOC is small or vanishes by symmetry, ISC can proceed by electronic spin-spin coupling (SSC) or hyperfine interaction (HFI). Although this review discusses SSC- and HFI-based ISC, the emphasis is on SOC-based ISC. In addition to laying the theoretical foundations for the understanding of ISC, the review elaborates on the qualitative rules for estimating transition probabilities. Research on the mechanisms of ISC has experienced a major revival in recent years owing to its importance in organic light-emitting diodes (OLEDs). Exemplified by challenging case studies, chemical substitution and solvent environment effects are discussed with the aim of helping the reader to understand and thereby get a handle on the factors that steer the efficiency of ISC.
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Affiliation(s)
- Christel M Marian
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf 40204, Germany;
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14
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Gómez-Piñeiro RJ, Pantazis DA, Orio M. Comparison of Density Functional and Correlated Wave Function Methods for the Prediction of Cu(II) Hyperfine Coupling Constants. Chemphyschem 2020; 21:2667-2679. [PMID: 33201578 PMCID: PMC7756273 DOI: 10.1002/cphc.202000649] [Citation(s) in RCA: 12] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/13/2020] [Indexed: 12/19/2022]
Abstract
The reliable prediction of Cu(II) hyperfine coupling constants remains a challenge for quantum chemistry. Until recently only density functional theory (DFT) could target this property for systems of realistic size. However, wave function based methods become increasingly applicable. In the present work, we define a large set of Cu(II) complexes with experimentally known hyperfine coupling constants and use it to investigate the performance of modern quantum chemical methods for the prediction of this challenging spectroscopic parameter. DFT methods are evaluated against orbital‐optimized second‐order Møller‐Plesset (OO‐MP2) theory and coupled cluster calculations including singles and doubles excitations, driven by the domain‐based local pair natural orbital approach (DLPNO‐CCSD). Special attention is paid to the definition of a basis set that converges adequately toward the basis set limit for the given property for all methods considered in this study, and a specifically optimized basis set is proposed for this purpose. The results suggest that wave function based methods can supplant but do not outcompete DFT for the calculation of Cu(II) hyperfine coupling constants. Mainstream hybrid functionals such as B3PW91 remain on average the best choice.
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Affiliation(s)
| | - Dimitrios A Pantazis
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Maylis Orio
- Aix-Marseille Université, CNRS, iSm2, Marseille, France
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15
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Brodu A, Tessier MD, Canneson D, Dupont D, Ballottin MV, Christianen PCM, de Mello Donega C, Hens Z, Yakovlev DR, Bayer M, Vanmaekelbergh D, Biadala L. Hyperfine Interactions and Slow Spin Dynamics in Quasi-isotropic InP-based Core/Shell Colloidal Nanocrystals. ACS Nano 2019; 13:10201-10209. [PMID: 31464420 DOI: 10.1021/acsnano.9b03384] [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] [Indexed: 06/10/2023]
Abstract
Colloidal InP core nanocrystals are taking over CdSe-based nanocrystals, notably in optoelectronic applications. Despite their use in commercial devices, such as display screens, the optical properties of InP nanocrystals and especially their relation to the exciton fine structures remain poorly understood. In this work, we show that the ensemble magneto-optical properties of InP-based core/shell nanocrystals investigated in strong magnetic fields up to 30 T are strikingly different from other colloidal nanostructures. Notably, the mixing of the lowest spin-forbidden dark exciton state with the nearest spin-allowed bright state does not occur up to the highest magnetic fields applied. This lack of mixing in an ensemble of nanocrystals suggests an anisotropy tolerance of InP nanocrystals. This striking property allowed us to unveil the slow spin dynamics between Zeeman sublevels (up to 400 ns at 15 T). Furthermore, we show that the unexpected magnetic-field-induced lengthening of the dark exciton lifetime results from the hyperfine interaction between the spin of the electron in the dark exciton with the nuclear magnetic moments. Our results demonstrate the richness of the spin physics in InP quantum dots and stress the large potential of InP nanostructures for spin-based applications.
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Affiliation(s)
- Annalisa Brodu
- Debye Institute for Nanomaterials Science , Utrecht University , 3584 CC Utrecht , The Netherlands
| | - Mickael D Tessier
- Physics and Chemistry of Nanostructures , Ghent University , 9000 Ghent , Belgium
| | - Damien Canneson
- Experimentelle Physik 2 , Technische Universität Dortmund , 44227 Dortmund , Germany
| | - Dorian Dupont
- Physics and Chemistry of Nanostructures , Ghent University , 9000 Ghent , Belgium
| | - Mariana V Ballottin
- High Field Magnet Laboratory, HFML-EMFL , Radboud University , 6525 ED Nijmegen , The Netherlands
| | - Peter C M Christianen
- High Field Magnet Laboratory, HFML-EMFL , Radboud University , 6525 ED Nijmegen , The Netherlands
| | - Celso de Mello Donega
- Debye Institute for Nanomaterials Science , Utrecht University , 3584 CC Utrecht , The Netherlands
| | - Zeger Hens
- Physics and Chemistry of Nanostructures , Ghent University , 9000 Ghent , Belgium
| | - Dmitri R Yakovlev
- Experimentelle Physik 2 , Technische Universität Dortmund , 44227 Dortmund , Germany
- Ioffe Institute , Russian Academy of Sciences , 194021 St. Petersburg , Russia
| | - Manfred Bayer
- Experimentelle Physik 2 , Technische Universität Dortmund , 44227 Dortmund , Germany
- Ioffe Institute , Russian Academy of Sciences , 194021 St. Petersburg , Russia
| | - Daniel Vanmaekelbergh
- Debye Institute for Nanomaterials Science , Utrecht University , 3584 CC Utrecht , The Netherlands
| | - Louis Biadala
- Experimentelle Physik 2 , Technische Universität Dortmund , 44227 Dortmund , Germany
- Institut d'Électronique, de Microélectronique et de Nanotechnologie , UMR CNRS 8520 , 59652 Villeneuve d'Ascq , France
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16
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Letuta UG, Berdinskiy VL, Udagawa C, Tanimoto Y. Enzymatic mechanisms of biological magnetic sensitivity. Bioelectromagnetics 2017; 38:511-521. [PMID: 28715606 DOI: 10.1002/bem.22071] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 06/24/2017] [Indexed: 11/08/2022]
Abstract
Primary biological magnetoreceptors in living organisms is one of the main research problems in magnetobiology. Intracellular enzymatic reactions accompanied by electron transfer have been shown to be receptors of magnetic fields, and spin-dependent ion-radical processes can be a universal mechanism of biological magnetosensitivity. Magnetic interactions in intermediate ion-radical pairs, such as Zeeman and hyperfine (HFI) interactions, in accordance with proposed strict quantum mechanical theory, can determine magnetic-field dependencies of reactions that produce biologically important molecules needed for cell growth. Hyperfine interactions of electrons with nuclear magnetic moments of magnetic isotopes can explain the most important part of biomagnetic sensitivities in a weak magnetic field comparable to the Earth's magnetic field. The theoretical results mean that magnetic-field dependencies of enzymatic reaction rates in a weak magnetic field that can be independent of HFI constant a, if H << a, and are determined by the rate constant of chemical transformations in the enzyme active site. Both Zeeman and HFI interactions predict strong magnetic-field dependence in weak magnetic fields and magnetic-field independence of enzymatic reaction rate constants in strong magnetic fields. The theoretical results can explain the magnetic sensitivity of E. coli cell and demonstrate that intracellular enzymatic reactions are primary magnetoreceptors in living organisms. Bioelectromagnetics. 38:511-521, 2017. © 2017 Wiley Periodicals, Inc.
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17
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Zaripov R, Vavilova E, Khairuzhdinov I, Salikhov K, Voronkova V, Abdulmalic MA, Meva FE, Weheabby S, Rüffer T, Büchner B, Kataev V. Tuning the spin coherence time of Cu(II)-(bis)oxamato and Cu(II)-(bis)oxamidato complexes by advanced ESR pulse protocols. Beilstein J Nanotechnol 2017; 8:943-955. [PMID: 28546889 PMCID: PMC5433190 DOI: 10.3762/bjnano.8.96] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 03/29/2017] [Indexed: 06/07/2023]
Abstract
We have investigated with the pulsed ESR technique at X- and Q-band frequencies the coherence and relaxation of Cu spins S = 1/2 in single crystals of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opba)] (1%) in the host lattice of [n-Bu4N]2[Ni(opba)] (99%, opba = o-phenylenebis(oxamato)) and of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opbon-Pr2)] (1%) in the host lattice of [n-Bu4N]2[Ni(opbon-Pr2)] (99%, opbon-Pr2 = o-phenylenebis(N(propyl)oxamidato)). For that we have measured the electron spin dephasing time Tm at different temperatures with the two-pulse primary echo and with the special Carr-Purcell-Meiboom-Gill (CPMG) multiple microwave pulse sequence. Application of the CPMG protocol has led to a substantial increase of the spin coherence lifetime in both complexes as compared to the primary echo results. It shows the efficiency of the suppression of the electron spin decoherence channel in the studied complexes arising due to spectral diffusion induced by a random modulation of the hyperfine interaction with the nuclear spins. We argue that this method can be used as a test for the relevance of the spectral diffusion for the electron spin decoherence. Our results have revealed a prominent role of the opba4- and opbon-Pr24- ligands for the dephasing of the Cu spins. The presence of additional 14N nuclei and protons in [Cu(opbon-Pr2)]2- as compared to [Cu(opba)]2- yields significantly shorter Tm times. Such a detrimental effect of the opbon-Pr24- ligands has to be considered when discussing a potential application of the Cu(II)-(bis)oxamato and Cu(II)-(bis)oxamidato complexes as building blocks of more complex molecular structures in prototype spintronic devices. Furthermore, in our work we propose an improved CPMG pulse protocol that enables elimination of unwanted echoes that inevitably appear in the case of inhomogeneously broadened ESR spectra due to the selective excitation of electron spins.
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Affiliation(s)
- Ruslan Zaripov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Evgeniya Vavilova
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Iskander Khairuzhdinov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Kev Salikhov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Violeta Voronkova
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Mohammad A Abdulmalic
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Francois E Meva
- Department of Pharmaceutical Sciences, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, BP 2701, Cameroon
| | - Saddam Weheabby
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Tobias Rüffer
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
- Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Vladislav Kataev
- Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
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18
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Chen F, Yao GH, Zhang ZL, Liu FC, Chen DM. Nuclear-Spin-Induced Circular Dichroism in the Infrared Region for Liquids. Chemphyschem 2015; 16:1954-9. [PMID: 25827496 DOI: 10.1002/cphc.201500129] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Indexed: 11/11/2022]
Abstract
Recently, the nuclear-spin-induced optical rotation (NSOR) and circular dichroism (NSCD) for liquids were discovered and extensively studied and developed. However, so far, nuclear-spin-induced magnetic circular dichroism in the IR region (IR-NSCD) has not been explored, even though all polyatomic molecules exhibit extensive IR spectra. Herein, IR-NSCD is proposed and discussed theoretically. The results indicate that in favorable conditions the IR-NSCD angle may be much larger than the NSOR angle in the UV/Vis region due to a vibrational resonance effect and can be measurable by using the NSOR experiment scheme. IR-NSCD can automatically combine and give NMR spectra and IRCD spectra of the nuclear spin prepolarized samples in liquids, which, in principle, could be developed to become a unique, novel analytical tool.
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Affiliation(s)
- Fang Chen
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026 (P.R. China)
| | - Guo-hua Yao
- Key Laboratory of Ion Beam Bio-engineering, Institute of Technical Biology and Agriculture Engineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031 (P.R. China)
| | - Zhen-lin Zhang
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026 (P.R. China)
| | - Fan-chen Liu
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026 (P.R. China)
| | - Dong-ming Chen
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026 (P.R. China).
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19
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Voronov VK. The study of structure and dynamics of molecules: NMR spectra transformed by superfine coupling. Magn Reson Chem 2015; 53:188-193. [PMID: 25585862 DOI: 10.1002/mrc.4170] [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: 06/02/2014] [Revised: 09/21/2014] [Accepted: 09/29/2014] [Indexed: 06/04/2023]
Abstract
In the present paper, the peculiarities of NMR phenomenon in paramagnetic systems are reported. Specifics of detection of high-resolution NMR spectra transformed by superfine interaction are discussed. Concrete examples illustrate the modern possibilities of NMR application for the study of structure and dynamics of the molecular (multielectron) systems.
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Affiliation(s)
- Vladimir K Voronov
- Irkutsk State Technical University, Lermontov Street 83, 664074, Irkutsk, Russia
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20
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Piccinato MT, da Costa MF, Ota AT, Guedes CLB, Di Mauro E. ESR and calculations on electronic structure of phenalenyl and phenalenyl derivative radicals. Magn Reson Chem 2015; 53:99-102. [PMID: 25263851 DOI: 10.1002/mrc.4140] [Citation(s) in RCA: 2] [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: 02/07/2014] [Revised: 08/04/2014] [Accepted: 08/11/2014] [Indexed: 06/03/2023]
Abstract
Calculations on electronic structure of the perinaphthenyl radical and phenalenyl derivative radicals responsible for the composition of the ESR spectrum of marine diesel under heating were performed to obtain support for the experimental ESR results. The parameters calculated were the hyperfine coupling constants (A), which were then used for comparison with the experimental data. The energy-minimized structures were obtained using the density functional theory method. In all cases, the symmetry system was taken into account in theoretical calculations. The differences between experimental and theoretical values were below 7% for nearest hydrogens in molecules, named hyperfine coupling constant A (first neighbors) and 18% for farthest hydrogens atoms named hyperfine coupling constants A' (second neighbors), for all structures analyzed.
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Affiliation(s)
- Marilene Turini Piccinato
- Laboratory of Fluorescence and Electron Paramagnetic Resonance (LAFLURPE)-CCE, State University of Londrina (UEL), 86057-970, Londrina, PR, Brazil
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21
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Lau JCS, Wagner-Rundell N, Rodgers CT, Green NJB, Hore PJ. Effects of disorder and motion in a radical pair magnetoreceptor. J R Soc Interface 2010; 7 Suppl 2:S257-64. [PMID: 20007172 PMCID: PMC2844003 DOI: 10.1098/rsif.2009.0399.focus] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2009] [Accepted: 11/18/2009] [Indexed: 11/12/2022] Open
Abstract
A critical requirement in the proposed chemical model of the avian magnetic compass is that the molecules that play host to the magnetically sensitive radical pair intermediates must be immobilized and rotationally ordered within receptor cells. Rotational disorder would cause the anisotropic responses of differently oriented radical pairs within the same cell to interfere destructively, while rapid molecular rotation would tend to average the crucial anisotropic magnetic interactions and induce electron spin relaxation, reducing the sensitivity to the direction of the geomagnetic field. So far, experimental studies have been able to shed little light on the required degree of ordering and immobilization. To address this question, computer simulations have been performed on a collection of radical pairs undergoing restricted rigid-body rotation, coherent anisotropic spin evolution, electron spin relaxation and spin-selective recombination reactions. It is shown that the ordering and motional constraints necessary for efficient magnetoreception can be simultaneously satisfied if the radical pairs are uniaxially ordered with a moderate order parameter and if their motional correlation time is longer than about a quarter of their lifetime.
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Affiliation(s)
| | | | | | | | - P. J. Hore
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
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