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Zinenko, V. I.
Ab initio calculation of the ferroelectric phase transition in disordered and ordered PbSc0.5Ta0.5O3 and PbSc0.5Nd0.5O3 solid solutions with the use of a model Hamiltonian / V. I. Zinenko, N. G. Zamkova // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 3. - P. 542-549, DOI 10.1134/S1063776108030138. - Cited References: 17 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
RELAXOR FERROELECTRICS
   PEROVSKITES
   BATIO3
   PBTIO3
Кл.слова (ненормированные):
Approximation theory -- Ferroelectric materials -- Hamiltonians -- Mathematical models -- Monte Carlo methods -- Phase transitions -- Ferroelectric phase transition -- Gordon-Kim model -- Local-mode approximation -- Solid solutions
Аннотация: To describe the ferroelectric phase transition in ordered and disordered PbSc0.5Ta0.5O3 (PST) and PbSc0.5Nd0.5O3 (PSN) solid solutions, a model Hamiltonian is written in the local-mode approximation, in which long-range dipole-dipole and short-range interactions of local modes are taken into account. The Hamiltonian parameters are determined from the set of energies of a series of distorted structures, calculated within the nonempirical generalized Gordon-Kim model. The statistical mechanics of the systems with a model Hamiltonian is investigated by the Monte Carlo method. It is revealed that PSN solid solutions undergo a transition to the ferroelectric rhombohedral phase through an intermediate phase, existing in a narrow temperature range. PST solid solutions undergo a ferroelectric phase transition directly from the paraelectric cubic to the ferroelectric rhombohedral phase.

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Держатели документа:
[Zinenko, V. I.
Zamkova, N. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Зиненко, Виктор Иванович
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Valkov, V. V.
Application of indefinite metric for transition to bose description of Su(3) hamiltonians - excitation spectrum of spin nematics / V. V. Valkov, T. A. Valkova // Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. - Vol. 99, Is. 6. - P. 1881-1897. - Cited References: 37 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
BIQUADRATIC EXCHANGE
   PHASE-TRANSITIONS
   DIAGRAM TECHNIQUE
   MAGNETISM
   FIELD
   STATE
Аннотация: A procedure is developed for a correct transition to the Bose representation for quantum SU(3) Hamiltonians. The analysis is carried out for a spin nematic by applying the indefinite metric formalism and pseudo-Hubbard operators. An important aspect of the theory is that the finiteness of the number of physical states is taken into account. This is attained by introducing and consistently taking into account the metric operator for which purpose a simple expression in terms of Bose operators is suggested. It is shown that in this approach the quantum Bose analog of the Hamiltonian is an Hermitian operator. This circumstance removes a number of principle contradictions which appeared previously on application of the Bose analog of the Hamiltonian derived by virtually identifying the Hubbard and pseudo-Hubbard operators and ignoring the finiteness of the number of physical states. The integral equations defining the chief characteristics of the system are obtained and solved analytically for the spin-nematic state of a magnet with S = 1 and by taking into account anharmonic effects. This permits one to write down in nonlinear theory explicit expressions for the two branches of the quantum excitation spectrum. The character of the renormalization of the spectrum parameters due to the presence of zero-point quantum oscillations is studied. The renormalization of the critical field on transition of the system from the spin nematic state is calculated analytically.

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Доп.точки доступа:
Valkova, T. A.; Вальков, Валерий Владимирович
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Application of the new LDA plus GTB method for the band structure calculation of n-type cuprates / M. M. Korshunov [et al.] // Physica B. - 2006. - Vol. 378-80: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P. 459-460, DOI 10.1016/j.physb.2006.01.340. - Cited References: 11 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
SUPERCONDUCTIVITY
PARAMETERS
DENSITY
Кл.слова (ненормированные):
strongly correlated electron systems -- superconductivity -- n-type cuprates -- n-type cuprates -- Strongly correlated electron systems -- Superconductivity -- Electronic structure -- Hamiltonians -- Mathematical models -- Oxide superconductors -- Perturbation techniques -- Intercluster hopping -- N-type cuprates -- Strongly correlated electron systems -- Band structure
Аннотация: A novel hybrid scheme is proposed and applied for band structure calculations of undoped n-type cuprate Nd2CuO4. The ab initio LDA calculation is used to obtain single electron and Coulomb parameters of the multiband Hubbard-type model. In strong correlation regime the electronic structure within this model is calculated by the generalized tight-binding (GTB) method, that combines the exact diagonalization of the model Hamiltonian for a small cluster with perturbation treatment of the intercluster hopping and interactions. For Nd2CuO4, this scheme results in charge transfer insulator with value of the gap and band dispersion in agreement to the experimental data. (c) 2006 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620219, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Institute of Metal Physics, Russian Academy, Sciences-Ural Division, GSP-170, 620219 Yekaterinburg, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Nekrasov, I. A.; Pchelkina, Z. V.; Anisimov, V. I.
}
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Rotter, I.
Avoided level crossings, diabolic points, and branch points in the complex plane in an open double quantum dot / I. . Rotter, A. F. Sadreev // Phys. Rev. E. - 2005. - Vol. 71, Is. 3. - Ст. 36227, DOI 10.1103/PhysRevE.71.036227. - Cited References: 49 . - ISSN 1063-651X

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
BERRY TOPOLOGICAL PHASE
   EXCEPTIONAL POINTS
   GEOMETRIC PHASES
   NUCLEAR REACTIONS
   RESONANCE STATES
   UNIFIED THEORY
   S-MATRIX
   CONTINUUM
   REPULSION
   INTERFEROMETER
Кл.слова (ненормированные):
Branch points in the complex plane (BPCP) -- Diabolic points (DP) -- Geometric phases -- Riemann sheets -- Eigenvalues and eigenfunctions -- Electron energy levels -- Functions -- Hamiltonians -- Quantum theory -- Resonance -- Topology -- Semiconductor quantum dots
Аннотация: We study the spectrum of an open double quantum dot as a function of different system parameters in order to receive information on the geometric phases of branch points in the complex plane (BPCP). We relate them to the geometrical phases of the diabolic points (DPs) of the corresponding closed system. The double dot consists of two single dots and a wire connecting them. The two dots and the wire are represented by only a single state each. The spectroscopic values follow from the eigenvalues and eigenfunctions of the Hamiltonian describing the double dot system. They are real when the system is closed, and complex when the system is opened by attaching leads to it. The discrete states as well as the narrow resonance states avoid crossing. The DPs are points within the avoided level crossing scenario of discrete states. At the BPCP, width bifurcation occurs. Here, different Riemann sheets evolve and the levels do not cross anymore. The BPCP are physically meaningful. The DPs are unfolded into two BPCP with different chirality when the system is opened. The geometric phase that arises by encircling the DP in the real plane, is different from the phase that appears by encircling the BPCP. This is found to be true even for a weakly opened system and the two BPCP into which the DP is unfolded.

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Держатели документа:
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
Astafev Krasnoyarsk Pedag Univ, Krasnoyarsk 660049, Russia
ИФ СО РАН
Max-Planck-Inst. Physik Komplexer S., D-01187 Dresden, Germany
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
Dept. of Physics and Measurement, Technology Linkoping University, S-581 83 Linkoping, Sweden
Astafev Krasnoyarsk Pedagogical U., 660049 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович
}
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    Bloch oscillations of Bose-Einstein condensates: Quantum counterpart of dynamical instability / A. R. Kolovsky, H. J. Korsch, E. M. Graefe // Phys. Rev. A. - 2009. - Vol. 80, Is. 2, DOI 10.1103/PhysRevA.80.023617. - Cited Reference Count: 35. - Гранты: We thank D. Witthaut and F. Trimborn for valuable comments. Support from the Deutsche Forschungsgemeinschaft via the Graduiertenkolleg "Nichtlineare Optik und Ultrakurzzeitphysik" is gratefully acknowledged. - Финансирующая организация: Deutsche Forschungsgemeinschaft . - ISSN 1050-2947
Рубрики:
OPTICAL LATTICE
   ATOMS
Кл.слова (ненормированные):
Bloch dynamics -- Bloch oscillations -- Bogoliubov -- Bose-Einstein condensates -- Chaotic dynamics -- Cold atoms -- Decoherence -- Dinger equation -- Dynamical instabilities -- Equipartition -- Hubbard -- Mean-field -- Optical lattices -- Quantum counterpart -- Quasi-one-dimensional -- Quasimomentum -- Bose-Einstein condensation -- Hamiltonians -- Nonlinear equations -- Steam condensers -- Stability
Аннотация: We study the Bloch dynamics of a quasi-one-dimensional Bose-Einstein condensate of cold atoms in a tilted optical lattice modeled by a Hamiltonian of Bose-Hubbard type. The corresponding mean-field system described by a discrete nonlinear Schrodinger equation can exhibit dynamical (or modulation) instability due to chaotic dynamics and equipartition over the quasimomentum modes. It is shown that these phenomena are related to Bogoliubov's depletion of the Bose-Einstein condensate and a decoherence of the condensate in the many-particle description. Three types of dynamics are distinguished: (i) decaying oscillations in the region of dynamical instability and (ii) persisting Bloch oscillations or (iii) periodic decay and revivals in the region of stability.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660036, Russia
Tech Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany

Доп.точки доступа:
Kolovsky, A. R.; Коловский, Андрей Радиевич; Korsch, H. J.; Graefe, E. M.
}
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Ovchinnikov, S. G.
Covalence-induced stabilization of an intermediate-spin state and the magnetic susceptibility of LaCoO3 / S. G. Ovchinnikov, Y. S. Orlov // J. Exp. Theor. Phys. - 2007. - Vol. 104, Is. 3. - P. 436-444, DOI 10.1134/S1063776107030090. - Cited References: 24. - This work was supported by the program of the Division of Physical Sciences of the Russian Academy of Sciences “Strong Electronic Correlations,” the integration project SORAN-URORAN (grant no. 74), and the Krasnoyarsk krai Science Foundation . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
TRANSITION
Кл.слова (ненормированные):
Band structure -- Electron transitions -- Ground state -- Hamiltonians -- Magnetic susceptibility -- Magnetic variables measurement -- Spin dynamics -- Covalence induced stabilization -- Diagnoalization -- Orbital degeneracy -- Spin states -- Lanthanum compounds
Аннотация: The energies of terms with spins S = 0, 1, 2 have been found using exact diagonalization of the multielectron Hamlitonian of a multiband pd model for the CoO6 cluster. Co (e(g) orbital)-O hops, which form the covalent sigma bond, are shown to decrease the energy of the state (IS) with an intermediate spin (S = 1) as compared to the energy of the state (LS) with a low spin (S = 0). An analogue of the Tanabe-Sugano diagram that takes into account the covalence of the CoO6 cluster is constructed. The state with S = 1 is shown to be a ground state at certain model parameters. An increase in temperature is established to decrease the crystal field and, thus, favors the transition of the ground state from LS to IS at T = 100 K and the transition of the IS ground state to a state (HS) with a high spin (S = 2) at T = 550 K. The magnetic susceptibility of LaCoO3 is calculated with allowance for the LS, IS, and HS states and for the fact that the HS state exhibits threefold orbital degeneracy of the t(2g) shell, which results in an effective orbital moment L = 1 and the importance of spin-orbit interaction. The behavior of this magnetic susceptibility agrees well with the experimental chi(T) dependence of LaCoO3.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Стабилизация состояния с промежуточным спином за счет ковалентности и особенности магнитной восприимчивости в LaCoO[3] [Текст] / С. Г. Овчинников, Ю. С. Орлов // Журн. эксперим. и теор. физ. - 2007. - Т. 131 Вып. 3. - С. 485-493

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademogorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Овчинников, Сергей Геннадьевич
}
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Zobov, V. E.
Effect of intramolecular interaction on time growth of second moment of multiple quantum NMR in solids / V. E. Zobov, A. A. Lundin // INTERNATIONAL CONFERENCE ON RESONANCES IN CONDENSED MATTER: ALTSHULER100. Ser. Journal of Physics Conference Series : IOP PUBLISHING LTD, 2011. - Vol. 324: International Conference on Resonances in Condensed Matter (JUN 21-25, 2011, Kazan, RUSSIA). - Ст. 12010, DOI 10.1088/1742-6596/324/1/012010. - Cited References: 12 . - ISBN 1742-6588

РУБ Physics, Condensed Matter
Рубрики:
COHERENCES
DYNAMICS
Кл.слова (ненормированные):
Dipole dipole interactions -- Double-quantum -- Intramolecular interactions -- Multiple quantum NMR -- Nuclear spin system -- Quantum spectrum -- Rate increase -- Second moments -- Solids containing methyl groups -- Time dependence -- Functional groups -- Quantum optics -- Solids -- Spin dynamics -- Hamiltonians
Аннотация: The time dependence of the NMR multiple quantum spectrum in solids containing methyl groups is investigated. We studied both of types of the nuclear spin systems: namely linking by secular part of the mutual dipole-dipole interaction and linking by effective double quantum Hamiltonian. It is revealed for the first type of systems the rate with the time of the growing up of the second moment when intramolecular interaction is present becomes less in compare with situation when a strong intramolecular interaction is absent. On the contrary for the second type of Hamiltonian the above rate increases.

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Держатели документа:
[Zobov, V. E.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russian Federation
N.N. Semenov Institute of Chemical Physics, RAS, 117977, Moscow, Russian Federation

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
}
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Korshunov, M. M.
Effective Hamiltonian and the properties of normal and superconductive phases of n-type cuprates / M. M. Korshunov, S. G. Ovchinnikov, A. V. Sherman // Physica B. - 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P. 521-523, DOI 10.1016/j.physb.2005.01.134. - Cited References: 13 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
MODEL
SYMMETRY
Кл.слова (ненормированные):
strong electron correlations -- superconductivity -- multiband p-d model -- n-type cuprates -- Multiband p-d model -- n-type cuprates -- Strong electron correlations -- Superconductivity -- Antiferromagnetism -- Correlation theory -- Fermi surface -- Hamiltonians -- Mathematical models -- Microscopic examination -- Oxide superconductors -- Phase diagrams -- Semiconductor doping -- Generalized tight-binding (GTB) -- Multiband p-d models -- N-type cuprates -- Single electron correlations -- Superconductivity
Аннотация: In the framework of the effective low-energy model for high-T-c, cuprates with account for three-center interaction terms and spin fluctuations the properties of normal and superconducting phases of n-type cuprates are investigated. Microscopic model parameters were obtained from ARPES data in undoped compounds. Obtained evolution of the chemical potential with doping, Fermi surface at optimal doping, and T-c(x) phase diagram are in remarkably good agreement with the experiment. (c) 2005 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia
ИФ СО РАН
LV Kirensky Institute of Physics, Siberian Br. of Russ. Acad. of Sci., Krasnoyarsk, 660036, Russian Federation
Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Sherman, A. V.; Коршунов, Максим Михайлович
}
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Ovchinnikov, S. G.
Effective Hamiltonian for HTSC cuprates taking into account electron-phonon interaction in the strong-correlation regime / S. G. Ovchinnikov, E. I. Shneider // J. Exp. Theor. Phys. - 2005. - Vol. 101, Is. 5. - P. 844-855, DOI 10.1134/1.2149064. - Cited References: 38. - This work was supported by the Russian Foundation for Basic Research (project no. 03-02-16124), the program “Quantum Macrophysics” of the Presidium of the Russian Academy of Sciences, the Foundation in Support for Russian Science, the Foundation of Noncommercial . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   D-WAVE SUPERCONDUCTIVITY
   T-C
   DISPERSION
   SCATTERING
   OXIDES
   STATE
   MODEL
Кл.слова (ненормированные):
Electron beams -- Electronic structure -- Optimization -- Phonons -- Electron correlations -- Hubbard X operators -- Spin-photon interaction -- Hamiltonians
Аннотация: Electron-phonon interaction is sequentially derived from a realistic p-d multiband model for the cuprates under conditions of strong electron correlations. The electronic structure is described using the representation of the Hubbard X operators in a generalized tight-binding method. Dependences of the diagonal and off-diagonal (on lattice sites) matrix elements of electron-phonon interaction on the wavevectors are found for three phonon modes, namely, breathing, apical breathing, and bending modes. The interactions of the breathing and bending modes with electrons are shown to contribute to the formation of kinks in the (0; 0)-(pi; pi) and (0; 0)-(pi; 0) directions, respectively. A low-energy t-J* model with phonons is developed; apart from electron-phonon interaction, it also includes spin-phonon interaction. The elimination of phonons gives an effective electron-electron interaction that depends on the occupation number of a multielectron term and on the carrier concentration due to strong electron correlations. (c) 2005 Pleiades Publishing, Inc.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Эффективный гамильтониан для ВТСП-купратов с учетом электрон-фононного взаимодействия в режиме сильных корреляций [Текст] / С. Г. Овчинников, Е. И. Шнейдер // Журнал экспериментальной и теоретической физики. - 2005. - Т. 128 Вып. 5. - С. 974-986

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation

Доп.точки доступа:
Shneider, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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10.

Effective parameters of the band dispersion in n-type high-T-c superconductors / M. M. Korshunov [et al.] // Physica C. - 2004. - Vol. 402, Is. 4. - P. 365-370, DOI 10.1016/j.physc.2003.10.017. - Cited References: 32 . - ISSN 0921-4534

РУБ Physics, Applied
Рубрики:
DOPED CUPRATE SUPERCONDUCTORS
   TIGHT-BINDING METHOD
   QUASI-PARTICLES
   COPPER OXIDES
   LA2-XSRXCUO4
   SYMMETRY
   MODEL
   EVOLUTION
   ORDER
Кл.слова (ненормированные):
high-T-c superconductivity -- electronic correlations -- electron-doped cuprates -- Electron-doped cuprates -- Electronic correlations -- High-Tc superconductivity -- Approximation theory -- Atomic physics -- Band structure -- Binding energy -- Charge transfer -- Correlation methods -- Doping (additives) -- Electronic structure -- Hamiltonians -- Mathematical models -- Mathematical operators -- Oxide superconductors -- Perturbation techniques -- Photoelectron spectroscopy -- Atomic orbitals -- Conduction band -- Electron doped cuprates -- Electron spins -- Valence band -- High temperature superconductors
Аннотация: The electronic structure of electron-doped cuprates is discussed in the regions of small and optimal doping. For optimal doping we obtain the parameters from a simple tight-binding analysis by fitting ARPES data, and for small doping we study the band structure by the generalized tight-binding method that takes strong electronic correlations into account explicitly. This method has also reproduced well the ARPES data for small doping. The effective low-energy Hamiltonian is the t-t'-J model with hopping parameters t and t'. We compare both methods and find very good agreement for the value of t while t' is different because it is caused by the different contribution of the short-range spin correlations. (C) 2003 Elsevier B.V. All rights reserved.

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Держатели документа:
Free Univ Berlin, Inst Theoret Phys, D-14195 Berlin, Germany
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Krasnoyarsk 660036, Russian Federation
Inst. fur Theoretische Physik, Freie Universitat Berlin, Arnimallee 14, D-14195 Berlin, Germany

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Manske, D.; Eremin, I.
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11.

Ignatchenko, V. A.
Effects of cross correlations between inhomogeneities of the parameters of an isotropic medium on the spectrum and damping of elastic waves / V. A. Ignatchenko, D. S. Polukhin // J. Exp. Theor. Phys. - 2010. - Vol. 110, Is. 2. - P. 345-359, DOI 10.1134/S1063776110020184. - Cited References: 17. - This study was supported in part by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools (grant no. 3818.2008.3) and the Presidium of the Russian Academy of Sciences (program no. 27.1) and performed within the framework of the Federal Target Program (State Contract no. 02.740.11.0220). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
Cross correlations -- Dispersion law -- Elastic force -- Inhomogeneities -- Isotropic medium -- Negative cross-correlation -- Physical nature -- Two parameter -- Wave spectra -- Damping -- Dispersions -- Elastic waves -- Hamiltonians -- Dispersion (waves)
Аннотация: The dispersion and damping laws have been investigated for elastic waves in an isotropic medium with one- and three-dimensional inhomogeneities of the density p(x) of the material and the elastic force constants mu(x) and lambda(x) with allowance for the cross correlations between these inhomogeneities. It has been demonstrated that the positive cross correlations between mu(x) and lambda(x), as well as the negative cross correlations between p(x) and mu(x) or p(x) and lambda(x), lead to an enhancement of the modification of the dispersion law and an increase in the damping of waves. The positive cross correlations between p(x) and mu(x) or p(x) and lambda(x), as well as the negative cross correlations between mu(x) and lambda(x), result in the opposite effects: a weakening of the modification of the dispersion law and a decrease in the damping. An analysis of the results obtained in this paper and in our recent work [15] has made it possible to formulate the general regularity of the effects of cross correlations, irrespective of the physical nature of the waves: the effects of cross correlations between inhomogeneities of any two parameters of the material on the wave spectrum depend on whether both parameters related by the cross correlations belong to the same part of the Hamiltonian (i.e., if they both belong to either the kinetic part or the potential part of the Hamiltonian) or they belong to different parts of the Hamiltonian. The positive cross correlations lead to a greater modification of the dispersion law and to an increase in the damping of waves in the former case and to a decrease in these characteristics in the latter case. Correspondingly, the negative cross correlations in each of these cases result in the opposite effects. This regularity has been explained qualitatively.

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[Ignatchenko, V. A.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Polukhin, D. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodny 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Игнатченко, Вальтер Алексеевич
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12.

    Effects of cross correlations between inhomogeneities of the parameters of an isotropic medium on the spectrum and damping of elastic waves / V. A. Ignatchenko, D. S. Polukhin // J. Exp. Theor. Phys. - 2010. - Vol. 110, Is. 2. - P345-359, DOI 10.1134/S1063776110020184. - Cited Reference Count: 17. - Гранты: This study was supported in part by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools (grant no. 3818.2008.3) and the Presidium of the Russian Academy of Sciences (program no. 27.1) and performed within the framework of the Federal Target Program (State Contract no. 02.740.11.0220). - Финансирующая организация: Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools [3818.2008.3]; Presidium of the Russian Academy of Sciences [27.1]; Federal Target Program [02.740.11.0220] . - FEB. - ISSN 1063-7761
   Перевод заглавия: ВЛИЯНИЕ КРОССКОРРЕЛЯЦИИ МЕЖДУ НЕОДНОРОДНОСТЯМИ ПАРАМЕТРОВ ИЗОТРОПНОЙ СРЕДЫ НА СПЕКТР И ЗАТУХАНИЕ УПРУГИХ ВОЛН
Кл.слова (ненормированные):
Cross correlations -- Dispersion law -- Elastic force -- Inhomogeneities -- Isotropic medium -- Negative cross-correlation -- Physical nature -- Two parameter -- Wave spectra -- Damping -- Dispersions -- Elastic waves -- Hamiltonians -- Dispersion (waves)
Аннотация: The dispersion and damping laws have been investigated for elastic waves in an isotropic medium with one- and three-dimensional inhomogeneities of the density p(x) of the material and the elastic force constants mu(x) and lambda(x) with allowance for the cross correlations between these inhomogeneities. It has been demonstrated that the positive cross correlations between mu(x) and lambda(x), as well as the negative cross correlations between p(x) and mu(x) or p(x) and lambda(x), lead to an enhancement of the modification of the dispersion law and an increase in the damping of waves. The positive cross correlations between p(x) and mu(x) or p(x) and lambda(x), as well as the negative cross correlations between mu(x) and lambda(x), result in the opposite effects: a weakening of the modification of the dispersion law and a decrease in the damping. An analysis of the results obtained in this paper and in our recent work [15] has made it possible to formulate the general regularity of the effects of cross correlations, irrespective of the physical nature of the waves: the effects of cross correlations between inhomogeneities of any two parameters of the material on the wave spectrum depend on whether both parameters related by the cross correlations belong to the same part of the Hamiltonian (i.e., if they both belong to either the kinetic part or the potential part of the Hamiltonian) or they belong to different parts of the Hamiltonian. The positive cross correlations lead to a greater modification of the dispersion law and to an increase in the damping of waves in the former case and to a decrease in these characteristics in the latter case. Correspondingly, the negative cross correlations in each of these cases result in the opposite effects. This regularity has been explained qualitatively.

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Оригинал на русском языке Влияние кросскорреляции между неоднородностями параметров изотропной среды на спектр и затухание упругих волн [Текст] / В. А. Игнатченко, Д. С. Полухин // Журнал экспериментальной и теоретической физики. - Москва : Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука", 2010. - Т. 137 № 2. - С. 390-405

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Ignatchenko, V. A.; Игнатченко, Вальтер Алексеевич; Polukhin, D. S.; Полухин, Дмитрий Сергеевич
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13.

Ovchinnikov, S. G.
Electron-phonon interaction in cuprates with T and T '-structure in strongly correlated limit / S. G. Ovchinnikov, E. I. Shneyder // Physica B. - 2006. - Vol. 378-80: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P. 451-452, DOI 10.1016/j.physb.2006.01.195. - Cited References: 5 . - ISSN 0921-4526

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
superconductivity -- strong electron correlations -- electron-phonon interaction -- Electron-phonon interaction -- Strong electron correlations -- Superconductivity -- Correlation methods -- Hamiltonians -- Molecular structure -- Quantum theory -- Electron-phonon interaction -- Occupation factors -- Strong electron correlations -- Oxide superconductors
Аннотация: Electron-phonon interaction in cuprate oxides is consistently determined from realistic multi band p-d model in strong correlations limit. We consider the momenta dependence matrix elements of the EPI for modes which most coupled to electrons and analyze a possible mechanism of kink formation. By unitary transformation we obtain an effective low-energy single-band Hamiltonian that includes only electron-electron interactions renormalized by the electron-phonon coupling and depends on occupation factors. (c) 2006 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
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14.

Forming a dielectric exciton phase in strongly correlated systems with spin crossover / Y. S. Orlov, S. V. Nikolaev, V. A. Dudnikov, S. G. Ovchinnikov // Phys. Rev. B. - 2021. - Vol. 104, Is. 19. - Ст. 195103, DOI 10.1103/PhysRevB.104.195103. - Cited References: 46. - The authors thank the Russian Scientific Foundation for financial support under Grant No. 18-12-00022 . - ISSN 2469-9950
Кл.слова (ненормированные):
Antiferromagnetism -- Electronic structure -- Hamiltonians -- Antiferromagnetic orderings -- Effective Hamiltonian -- Electronic.structure -- High pressure -- High spins -- Spin crossovers -- Strong electron correlations -- Strongly correlated systems -- Two bands -- Two-band Hubbard model -- Excitons
Аннотация: Formation of the magnetic structure and exciton condensate of local magnetic excitons in strongly correlated systems near the spin crossover under high pressure is considered in terms of the effective Hamiltonian obtained from a two-band Hubbard model in the regime of strong electron correlations. The coexistence of the long-range antiferromagnetic order and exciton condensate and the occurrence of the magnetization caused by the condensation of local magnetic excitons are demonstrated. Transformation of the electronic structure of the antiferromagnetic high-spin insulator into the paramagnetic two-band correlated metal via a narrow-gap antiferromagnetic excitonic semiconductor is obtained.

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Держатели документа:
Institute of Engineering and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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15.

General framework of bound states in the continuum in an open acoustic resonator / L. Huang, B. Jia, A. S. Pilipchuk [et al.] // Phys. Rev. Appl. - 2022. - Vol. 18, Is. 5. - Ст. 054021, DOI 10.1103/PhysRevApplied.18.054021. - Cited References: 47. - L.H. and A.E.M. are supported by the Australian Research Council Discovery Project (Grant No. DP200101353) and the UNSW Scientia Fellowship program. Y.K.C. and D.A.P. are supported by the Australian Research Council Discovery Project (Grant No. DP200101708). B.J., S.H., and Y.L. are supported by the National Natural Science Foundation of China (Grant No. 12074286) and the Shanghai Science and Technology Committee (Grant No. 21JC1405600). A.P., E.B., and A.S. are supported by the Russian Science Foundation (Grant No. 22-12-00070) . - ISSN 2331-7019
Кл.слова (ненормированные):
Acoustic resonators -- Acoustic waveguides -- Bound-states -- Coupled waveguide resonators -- Degenerate modes -- Eigen modes -- General method -- High-Q resonances -- Momentum spaces -- Non-Hermitian Hamiltonians -- Waveguide-resonators -- Waveguide filters
Аннотация: Bound states in the continuum (BICs) provide a viable way of achieving high-Q resonances in both photonics and acoustics. In this work, we propose a general method of constructing Friedrich-Wintgen (FW) BICs and accidental BICs in a coupled acoustic waveguide-resonator system. We demonstrate that FW BICs can be achieved with arbitrary two degenerate resonances in a closed resonator, regardless of whether they have the same or opposite parity. Moreover, their eigenmode profiles can be arbitrarily engineered by adjusting the position of the attached waveguide. This suggests an effective way of continuously switching the nature of the BICs from FW BICs to symmetry-protected BICs or accidental BICs. Also, such BICs are sustained in the coupled waveguide-resonator system with shapes such as rectangles, ellipses, and rhomboids. These interesting phenomena are well explained by the two-level effective non-Hermitian Hamiltonian, where two strongly coupled degenerate modes play a major role in forming such FW BICs. Additionally, we find that such an open system also supports accidental BICs in geometry space instead of momentum space via tuning the position of the attached waveguide, which is attributed to the quenched coupling between the waveguide and eigenmodes of the closed cavity. Finally, we fabricate a series of three-dimensional coupled resonator waveguides and experimentally verify the existence of FW BICs and accidental BICs by measuring the transmission spectra. Our results complement the current BIC library in acoustics and provide nice routes for designing acoustic devices, such as acoustic absorbers, filters, and sensors.

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Держатели документа:
School of Engineering and Information Technology, University of New South Wales, Northcott Drive, Canberra, ACT 2600, Australia
Institute of Acoustics, Tongji University, Shanghai, 200092, China
L. V. Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, RAN, Krasnoyarsk, 660036, Russian Federation
Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, United States
Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028, United States

Доп.точки доступа:
Huang, L.; Jia, B.; Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Chiang, Y.; Huang, S.; Li, J.; Shen, C.; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Deng, F.; Powell, D. A.; Cummer, S. A.; Li, Y.; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Miroshnichenko, A. E.
}
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16.

Rotter, I.
Influence of branch points in the complex plane on the transmission through double quantum dots / I. . Rotter, A. F. Sadreev // Phys. Rev. E. - 2004. - Vol. 69, Is. 6. - Ст. 66201, DOI 10.1103/PhysRevE.69.066201. - Cited References: 25 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
ELECTRON-ATOM SCATTERING
   S-MATRIX
   DOUBLE POLES
   CONTINUUM
   SYSTEM
   MODEL
Кл.слова (ненормированные):
Eigenvalues and eigenfunctions -- Hamiltonians -- Mathematical models -- Matrix algebra -- Probability -- Resonance -- Scattering -- Wave propagation -- Branch points -- Open quantum systems -- Propagating modes -- Quantum computing devices -- Semiconductor quantum dots
Аннотация: We consider single-channel transmission through a double quantum dot system consisting of two single dots that are connected by a wire and coupled each to one lead. The system is described in the framework of the S matrix theory by using the effective Hamiltonian of the open quantum system. It consists of the Hamiltonian of the closed system (without attached leads) and a term that accounts for the coupling of the states via the continuum of propagating modes in the leads. This model allows one to study the physical meaning of branch points in the complex plane. They are points of coalesced eigenvalues and separate the two scenarios with avoided level crossings and without any crossings in the complex plane. They influence strongly the features of transmission through double quantum dots.

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Держатели документа:
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement, S-58183 Linkoping, Sweden
Astafev Kransnoyarsk Pedag Univ, Krasnoyarsk 660049, Russia
ИФ СО РАН
Max-Planck-Inst. Phys. Komplexer S., D-01187 Dresden, Germany
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Department of Physics, Linkoping University, S-581 83 Linkoping, Sweden
Astaf'ev Krasnoyarsk Pedagogical U., 89 Lebedeva, Krasnoyarsk, 660049, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович
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17.

Influence of magnetic ordering on the resistivity anisotropy of alpha-MnS single crystal / S. S. Aplesnin [et al.] // Solid State Commun. - 2004. - Vol. 129, Is. 3. - P. 195-197 ; Solid State Commun. - 2004. - Vol. 129, Is. 3. - P. 195-197, DOI 10.1016/j.ssc.2003.09.028. - Cited References: 7 . - ISSN 0038-1098. - Вариант Sopus

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
anisotropy of resistivity -- optical gap -- D. Anisotropy of resistivity -- D. Optical gap -- Antiferromagnetism -- Band structure -- Bandwidth -- Diffractometers -- Electron transitions -- Fermi level -- Hamiltonians -- Light absorption -- Magnetic anisotropy -- Magnetization -- Single crystals -- Spectroscopic analysis -- X ray diffraction analysis -- Coulomb repulsion -- Resistivity anisotropy -- Semiconducting manganese compounds -- D. Anisotropy of resistivity -- D. Optical gap -- Antiferromagnetism -- Band structure -- Bandwidth -- Diffractometers -- Electron transitions -- Fermi level -- Hamiltonians -- Light absorption -- Magnetic anisotropy -- Magnetization -- Single crystals -- Spectroscopic analysis -- X ray diffraction analysis -- Coulomb repulsion -- Resistivity anisotropy -- Semiconducting manganese compounds
Аннотация: The resistivity and the optical absorbtion spectra of single crystal alpha-MnS are studied in the temperature range 80-300 K along two directions [100] and [111]. Strong anisotropy of the resistivity, and the shift of absorbtion spectra band edge below T < 160 K are explained in terms of model involving delocalized holes in 3d-band manganese ions interacting with localized spins by using the sd-model. (C) 2003 Elsevier Ltd. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Siberian Branch, Academcumpus, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Branch, Academcumpus, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Abramova, G. M.; Абрамова, Галина Михайловна; Kiselev, N. I.; Romanova, O. B.; Романова, Оксана Борисовна

}
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18.

Optical spectroscopy of PrFe3(BO3)(4): Crystal-field and anisotropic Pr-Fe exchange interactions / M. N. Popova [et al.] // Phys. Rev. B. - 2009. - Vol. 80, Is. 19. - Ст. 195101, DOI 10.1103/PhysRevB.80.195101. - Cited References: 36. - We thank S. Klimin for useful information concerning the structure of PrFeINF3/INF(BOINF3/INF)INF4/INF and E. Chukalina for participating in some measurements. This work was supported in part by the Russian Foundation for Basic Research (Grants No. 07-02-01185 and No. 09-02-00930) and by the Russian Academy of Sciences under the Programs for Basic Research. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
TRIGONAL GDFE3(BO3)(4)
   NDFE3(BO3)(4)
   DYFE3(BO3)(4)
   TRANSITIONS
   BORATE
   ION
   ND
Кл.слова (ненормированные):
antiferromagnetic materials -- crystal field interactions -- exchange interactions (electron) -- infrared spectra -- iron compounds -- magnetic susceptibility -- magneto-optical effects -- paramagnetic materials -- praseodymium compounds -- spin Hamiltonians -- visible spectra
Аннотация: High-resolution polarized optical absorption spectra of PrFe3(BO3)(4) in the paramagnetic and antiferromagnetic phases are reported. The measured energies of the crystal-field (CF) levels within the 4f(2) configuration of Pr3+ in the paramagnetic PrFe3(BO3)(4) are described by the CF model that involves the 4f(2)/4f5d and 4f(2)/4f6p configuration interactions. Ordering of Fe spins along the crystalline c axis below T-N=32 K is confirmed by the analysis of the spectra of Er3+ introduced as a probe into PrFe3(BO3)(4). To account for the observed changes in the optical spectra of Pr3+ at temperatures below T-N, in particular, for the shift of the CF levels, splitting of the CF doublets, and the appearance of forbidden lines, the Pr-Fe exchange Hamiltonian defined by seven parameters is considered. The theoretical approach has been tested by calculating the temperature dependence of the magnetic susceptibility. A good agreement between theory and optical and magnetic experimental data is found demonstrating the validity of the model used. The obtained results confirm that the model of the iron dimers inside the spiral chains of Fe3+(O2-)(6) octahedrons introduced by us earlier for NdFe3(BO3)(4) and modified in the present work may serve as a basis for analyzing the low-temperature properties of other rare-earth iron borates.

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Держатели документа:
[Popova, M. N.
Stanislavchuk, T. N.] Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
[Malkin, B. Z.] Kazan VI Lenin State Univ, Kazan 420008, Russia
[Bezmaternykh, L. N.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, 142190 Moscow Region, Russian Federation
Kazan State University, 420008 Kazan, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popova, M. N.; Stanislavchuk, T. N.; Malkin, B. Z.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Foundation for Basic Research [07-02-01185, 09-02-00930]; Russian Academy of Sciences under the Programs for Basic Research
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19.

Bulgakov, E. N.
Phase rigidity and avoided level crossings in the complex energy plane / E. N. Bulgakov, I. . Rotter, A. F. Sadreev // Phys. Rev. E. - 2006. - Vol. 74, Is. 5. - Ст. 56204, DOI 10.1103/PhysRevE.74.056204. - Cited References: 40 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
OPEN QUANTUM-SYSTEMS
   FANO RESONANCES
   S-MATRIX
   DOT
   CONTINUUM
   TRANSMISSION
   COHERENCE
   TRANSPORT
   BILLIARDS
   PROBE
Кл.слова (ненормированные):
Eigenvalues and eigenfunctions -- Hamiltonians -- Resonance -- Rigidity -- Semiconductor quantum dots -- Biorthogonal eigenfunctions -- Open quantum system -- Phase rigidity -- Quantum theory
Аннотация: We consider the effective Hamiltonian of an open quantum system, its biorthogonal eigenfunctions phi(lambda), and define the value r(lambda)=(phi(lambda)parallel to phi(lambda))/ that characterizes the phase rigidity of the eigenfunctions phi(lambda). In the scenario with avoided level crossings, r(lambda) varies between 1 and 0 due to the mutual influence of neighboring resonances. The variation of r(lambda) is an internal property of an open quantum system. In the literature, the phase rigidity rho of the scattering wave function Psi(E)(C) is considered. Since Psi(E)(C) can be represented in the interior of the system by the phi(lambda), the phase rigidity rho of the Psi(E)(C) is related to the r(lambda) and therefore also to the mutual influence of neighboring resonances. As a consequence, the reduction of the phase rigidity rho to values smaller than 1 should be considered, at least partly, as an internal property of an open quantum system in the overlapping regime. The relation to measurable values such as the transmission through a quantum dot, follows from the fact that the transmission is, in any case, resonant at energies that are determined by the real part of the eigenvalues of the effective Hamiltonian. We illustrate the relation between phase rigidity rho and transmission numerically for small open cavities.

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Держатели документа:
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
ИФ СО РАН
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Department of Physics and Measurement, Technology Linkoping University, S-581 83 Linkoping, Sweden

Доп.точки доступа:
Rotter, I.; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
}
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20.

Prediction of the in-gap states above the top of the valence band in undoped insulating cuprates due to the spin-polaron effect / S. G. Ovchinnikov [et al.] // J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 8. - P. L93-L100, DOI 10.1088/0953-8984/16/8/L04. - Cited References: 25 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
   LA2-XSRXCUO4
   MODEL
   ANTIFERROMAGNETISM
   SPECTRA
   OXIDES
Кл.слова (ненормированные):
Quasiparticle band structure -- Spin-polaron effect -- Antiferromagnetic materials -- Approximation theory -- Doping (additives) -- Electronic structure -- Hamiltonians -- Insulation -- Magnetic fields -- Strontium compounds -- Thermal effects -- Lanthanum compounds
Аннотация: In the framework of the generalized tight binding method we have calculated the quasiparticle band structure and the spectral functions of the undoped cuprates such as La2CuO4, Sr2CUO2Cl2 etc. Due to spin fluctuations the in-gap state appears above the top of the valence band in the undoped antiferromagnetic insulator similar to in-gap states induced by hole doping. In the ARPES experiments the in-gap states can be detected as weak low energy satellites.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Borisov, A. A.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Korshunov, M. M.; Коршунов, Максим Михайлович
}
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