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Gavrichkov, V. A.
Doped Mott-Hubbard materials with a low quasiparticle transparency / V. A. Gavrichkov // Phys. Rev. B. - 2024. - Vol. 109, Is. 12. - Ст. 125139, DOI 10.1103/PhysRevB.109.125139. - Cited References: 48. - This work has been supported by the grant of the Russian Science Foundation, RSF 22-22-00298 . - ISSN 2469-9950. - ISSN 2469-9969
Аннотация: Based on the Wilson's criterion metal/insulator, extended to materials with strong electronic correlations, we have identified a specific class of the materials, which is not associated with their usual classification into Mott-Hubbard and charge transfer dielectrics. The local symmetry of these materials leads to the disappearance of quasiparticle states (so-called first removal or first extra states) in the Hubbard gap. It is especially unusual for doped materials, in which quasiparticles, being charge carriers, can disappear or appear under external factors without the Mott transition being achieved. In this work, we introduce the so-called “quasiparticle transparency”, and provide specific experiments to identify materials with the low quasiparticle transparency. A number of examples of such materials with a spin crossover under high pressure, showing the Jahn-Teller nature, are considered.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
Rome International Center for Materials Science Superstripes RICMASS, via del Sabelli 119A, 00185 Roma, Italy

Доп.точки доступа:
Гавричков, Владимир Александрович
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Muraev, P. S.
Signatures of quantum chaos and fermionization in the incoherent transport of bosonic carriers in the Bose-Hubbard chain / P. S. Muraev, D. N. Maksimov, A. R. Kolovsky // Phys. Rev. E. - 2024. - Vol. 109, Is. 3. - Ст. L032107, DOI 10.1103/PhysRevE.109.L032107. - Cited References: 34. - The authors acknowledge financial support from the Ministry of Science and Higher Education of Russian Federation (Project No. FSRZ-2023-0006) . - ISSN 2470-0045. - ISSN 2470-0053
Аннотация: We analyze the stationary current of Bose particles across the Bose-Hubbard chain connected to a battery, focusing on the effect of interparticle interactions. It is shown that the current magnitude drastically decreases as the strength of interparticle interactions exceeds the critical value which marks the transition to quantum chaos in the Bose-Hubbard Hamiltonian. We found that this transition is well reflected in the nonequilibrium many-body density matrix of the system. Namely, the level-spacing distribution for eigenvalues of the density matrix changes from Poisson to Wigner-Dyson distributions. With the further increase of the interaction strength, the Wigner-Dyson spectrum statistics change back to the Poisson statistics which now marks fermionization of the Bose particles. With respect to the stationary current, this leads to the counter-intuitive dependence of the current magnitude on the particle number.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Centre KSC SB RAS, 660036 Krasnoyarsk, Russia
School of Engineering Physics and Radio Electronics, Siberian Federal University, 660041 Krasnoyarsk, Russia
IRC SQC, Siberian Federal University, 660041 Krasnoyarsk, Russia

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; Мураев, Павел Сергеевич
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    Korovushkin, M. M.
    Electrical resistivity and the Hall effect in the doped Mott-Hubbard material with strong spin-charge coupling / M. M. Korovushkin // Phys. Scr. - 2023. - Vol. 98, Is. 12. - Ст. 125922, DOI 10.1088/1402-4896/ad05ed. - Cited References: 96. - Author is grateful to V V Val’kov, A D Fedoseev, D M Dzebisashvili and M S Shustin for fruitful discussions and permanent interest in this work. Author thanks V A Mitskan and A O Zlotnikov for technical support . - ISSN 0031-8949. - ISSN 1402-4896
   Перевод заглавия: Электросопротивление и эффект Холла в допированном мотт-хаббардовском материале с сильной спин-зарядовой связью
Кл.слова (ненормированные):
Mott-Hubbard materials -- spin-charge coupling -- spin polarons -- kinetic coefficients -- electrical resistance -- Hall effect
Аннотация: The kinetic characteristics of the doped Mott-Hubbard material are considered within the realistic spin-fermion model which takes into account the strong spin-charge coupling. The kinetic equation constructed on the basis of the mechanism of carrier scattering on the spin fluctuations is solved using the multi-moment method, which allows one to analyze the temperature behavior of nonequilibrium distribution function in the problems of electrical resistivity ρ and the Hall coefficient RH. The calculated dependences ρ(T) and RH(T) for the underdoped and optimally doped regimes demonstrate good qualitative agreement with the experimental data. In particular, the Hall coefficient calculated for the underdoped regime reproduces the experimentally observed sharp drop and even a change in sign at low temperatures.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Коровушкин, Максим Михайлович
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On the Dirac mass of Hubbard fermions in strongly correlated higher-order topological superconductor / S. V. Aksenov, A. D. Fedoseev, M. S. Shustin, A. O. Zlotnikov // Phys. Solid State. - 2023. - Vol. 65, Is. 7. - P1063-1070, DOI 10.61011/PSS.2023.07.56391.31H. - Cited References: 28. - The study was supported by the Russian Science Foundation (project No. 22-22-20076), and Krasnoyarsk Regional Fund of Science . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
topological phases -- Dirac fermions -- Coulomb interaction -- strong correlations -- Majorana modes
Аннотация: Majorana corner modes have a number of advantages over the conventional Majorana states in terms of performing topologically protected quantum computations. However, the problem of the influence of Coulomb repulsion on higher-order phases, which inevitably arises when trying to implement such systems in practice, has been poorly studied. In this article, we analyze the features of a topological invariant describing the nontrivial phase with the corner modes for a two-dimensional two-orbital model of a hybrid structure in the regime of extremely strong electron correlations. For this purpose, approximate wave functions of the edge states with a linear dispersion law and the associated Dirac masses, which arise when superconducting pairing in the system is taken into account, are obtained.

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Публикация на русском языке О дираковской массе хаббардовских фермионов в сильно коррелированном топологическом сверхпроводнике высокого порядка [Текст] / С. В. Аксенов, А. Д. Федосеев, М. С. Шустин, А. О. Злотников. - 9 с. // Физ. твердого тела. - 2023. - Т. 65 Вып. 7. - С. 1109-1117

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Shustin, M. S.; Шустин, Максим Сергеевич; Zlotnikov, A. O.; Злотников, Антон Олегович; Nanophysics and Nanoelectronics, International Symposium(XXVII ; 13-16 March 2023 ; Nizhny Novgorod, Russia)
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    Quantum transport via dot devices with arbitrarily strong interactions / A. B. Klyuchantsev, D. M. Dzebisashvili // Phys. Scr. - 2023. - Vol. 98, Is. 3. - Ст. 035811, DOI 10.1088/1402-4896/acb61e. - Cited References: 49. - The authors would like to thank V V Val'kov and S.V. Aksenov for fruitful discussions . - ISSN 0031-8949. - ISSN 1402-4896
   Перевод заглавия: Квантовый транспорт через точечные устройства со сколь угодно сильными взаимодействиями
Кл.слова (ненормированные):
non-equilibrium Green’s function -- Hubbard operator -- quantum transport -- quantum dot -- Anderson impurity model
Аннотация: The paper develops a theory of tunneling electron transport through atomic-scale systems (or briefly quantum dots) with arbitrarily strong interaction. The theory is based on a diagram technique for nonequilibrium Green’s functions defined on Hubbard operators. The use of Hubbard operators, describing many-body states of an entire quantum dot, makes it possible to represent the Hamiltonian of the quantum dot in a universal diagonal form and consider its coupling with two leads within the perturbation theory. It is shown that in the case when all Hubbard operators are defined for the same site, some rules of the diagram technique for Hubbard operators, initially developed for lattice models, have to be modified. As an example of the application of the modified theory, the current-voltage characteristics of the single-impurity Anderson model with infinitely large Coulomb repulsion are calculated. It is shown that taking into account the multiple electron tunneling processes with spin flips results in the dip in the center of the Lorentz distribution peak, describing the density of states of the one level Anderson impurity coupled with two leads. The emergence of this dip in the density of states leads to a peculiar feature in the bias voltage dependence of the differential conductivity, which can be detected experimentally.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Klyuchantsev, A. B.; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович
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One- and two-particle correlation functions in the cluster perturbation theory for cuprates / V. I. Kuz’min, S. V. Nikolaev, M. M. Korshunov, S. G. Ovchinnikov // Materials. - 2023. - Vol. 16, Is. 13. - Ст. 4640, DOI 10.3390/ma16134640. - Cited References: 63. - V.I.K. and S.V.N. acknowledge support from the Krasnoyarsk Regional Science Foundation and Russian Science Foundation, grant no. 22-22-20007. - We acknowledge useful discussions with E.I. Shneyder . - ISSN 1996-1944
Кл.слова (ненормированные):
strong electronic correlations -- cuprates -- Hubbard model -- cluster perturbation theory
Аннотация: The physics of high-Tc superconducting cuprates is obscured by the effect of strong electronic correlations. One way to overcome this problem is to seek an exact solution at least within a small cluster and expand it to the whole crystal. Such an approach is at the heart of cluster perturbation theory (CPT). Here, we developed CPT for the dynamic spin and charge susceptibilities (spin-CPT and charge-CPT), with the correlation effects explicitly taken into account by the exact diagonalization. We applied spin-CPT and charge-CPT to the effective two-band Hubbard model for the cuprates obtained from the three-band Emery model and calculated one- and two-particle correlation functions, namely, a spectral function and spin and charge susceptibilities. The doping dependence of the spin susceptibility was studied within spin-CPT and CPT-RPA, that is, the CPT generalization of the random phase approximation (RPA). In the underdoped region, both our methods resulted in the signatures of the upper branch of the spin excitation dispersion with the lowest excitation energy at the (π,π) wave vector and no presence of low-energy incommensurate excitations. In the high doping region, both methods produced a low energy response at four incommensurate wave vectors in qualitative agreement with the results of the inelastic neutron scattering experiments on overdoped cuprates.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 660036 Krasnoyarsk, Russia
Siberian Federal University, Svobodny Prospect 79, 660041 Krasnoyarsk, Russia

Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Nikolaev, S. V.; Николаев, Сергей Викторович; Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Features of spin crossovers in magnetic materials / Yu. S. Orlov, S. V. Nikolaev, V. A. Dudnikov [et al.] // Phys. Usp. - 2023. - Vol. 66, Is. 7. - P. 647-672, DOI 10.3367/UFNe.2022.05.039195. - Cited References: 237. - The authors thank the Russian Science Foundation for financial support in the framework of project no. 18-12-00022 . - ISSN 1063-7869. - ISSN 1468-4780
Кл.слова (ненормированные):
spin crossovers -- exchange interaction -- Bose condensationl -- spin excitons -- transition metal oxides -- rare earth cobaltites -- strong electron correlations -- antiferromagnetism -- ferromagnetism -- metal–insulator transition -- Earth's mantle -- Hubbard model
Аннотация: We present experimental and theoetical results of spin crossover studies in magnetically ordered materials. The effect of spin crossovers on the electronic structure of transition metal oxides and on the Bose condensation of spin excitons in the vicinity of the spin crossover is considered. A new method for calculating the interatomic superexchange interaction in transition metal oxides is discussed that allows considering selective contributions of excited magnetic cation terms. Changes in the exchange interaction sign are predicted for spin crossovers for d5—d7 ions. In the RCoO3 family of rare-earth cobaltites, the ground state is nonmagnetic, but, as the temperature increases, thermal excitations of high-spin states give rise to a number of experimentally detectable features. In defective RCoO3 samples, stabilization of the high-spin term and ferromagnetic ordering are possible. Dynamical crossovers under external pumping and the dynamics of multiplicity, magnetization, and local lattice distortions are discussed. Geophysical implications of spin crossovers are considered, and metallic properties of Earth's mantle at a depth of 1400—1800 km are predicted.

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Публикация на русском языке Особенности спиновых кроссоверов в магнитных материалах [Текст] / Ю. С. Орлов, С. В. Николаев, В. А. Дудников [и др.] // Успехи физ. наук. - 2023. - Т. 193 № 7. - С. 689–716

Держатели документа:
Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Academgorodok 50, str. 38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Effect of weak hubbard repulsion on spectrum and transport in higher-order topological superconductor / S. V. Aksenov, A. D. Fedoseev, M. S. Shustin, A. O. Zlotnikov // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. I : Magnetism and superconductivity. - Ст. I.P1. - P. 153-154. - Cited References: 5. - The study was supported by Russian Science Foundation, project 22-22-20076 . - ISBN 978-5-94469-051-7

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Shustin, M. S.; Шустин, Максим Сергеевич; Zlotnikov, A. O.; Злотников, Антон Олегович; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
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    Makarov, I. A.
    Enhanced s*-wave component of the superconducting gap in overdoped HTSC cuprates with orthorhombic distortion / I. A. Makarov, S. G. Ovchinnikov // Phys. Lett. A. - 2022. - Vol. 444. - Ст. 128226, DOI 10.1016/j.physleta.2022.128226. - Cited References: 67. - We would like to especially thank A. Bianconi for new ideas, useful discussions, and suggestions. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project “Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials” No. 20-42-240016 . - ISSN 0375-9601
   Перевод заглавия: Увеличенная s*-волновая компонента сверхпроводящей щели в передопированных ВТСП купратах с орторомбическим искажением
Кл.слова (ненормированные):
High-Tc superconductors -- Orthorhombic cuprates -- Hubbard model -- Superconductivity theory -- Fermi contour -- Superconducting gap symmetry
Аннотация: In this work, the concentration and temperature dependence of the superconducting gap of the HTSC cuprate in the orthorhombic phase are obtained within the framework of the Hubbard model taking into account the exchange mechanism of pairing. To elucidate the reasons for the unexpectedly large s*-wave component of the superconducting gap in the overdoped regime, the electronic structure of low-energy excitations and the k-dependent contributions of pair states to the gap components were investigated. It is shown that the s*-wave component growth results from the shallowing of the electron pocket in the region of the s*-wave component maximum.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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10.

Exchange interaction between the high spin Co3+ states in LaCoO3 / Y. S. Orlov, S. V. Nikolaev, V. A. Gavrichkov, S. G. Ovchinnikov // Comput. Mater. Sci. - 2022. - Vol. 204. - Ст. 111134, DOI 10.1016/j.commatsci.2021.111134. - Cited References: 59. - We are thankful to the Russian Science Foundation, Russia for the financial support under the project 18-12-00022 . - ISSN 0927-0256
Кл.слова (ненормированные):
Exchange interaction -- Spin-orbital interaction -- Magnetic phase diagram -- Antiferromagnetism -- Ferromagnetism -- Hubbard model
Аннотация: The formation of the exchange interaction between HS Co3+ ions, which are excited in LaCoO3, is studied within the multielectron approach. Two main contributions appear to be antiferromagnetic (AFM) and ferromagnetic (FM). When the ground state is LS, the total interaction is AFM. The crossover to the HS state may result in the FM ordering. The mean-field magnetic phase diagrams on the plane spin gap-temperature have been calculated without and with spin-orbital interaction in the HS term. Without spin-orbital interaction the reentrant magnetic order is possible. The spin-orbital coupling removes the reentrant phase transition and stabilizes the LS state. For known from experimental data values of the spin gap and exchange interaction, the ideal stoichiometric LaCoO3 is very close to the LS–HS crossover and magnetic ordering border. The violations of local coordination and symmetry of the Co3+-oxygen complexes that take place in the intergrain boundaries, at the surface of single crystals, and in the thin films on the strained substrate, may result in the formation of the HS state and FM order for such materials.

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Держатели документа:
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; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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11.

Val'kov, V. V.
Excitation spectrum in an ensemble of Hubbard bosons / V. V. Val’kov // JETP Lett. - 2022. - Vol. 116, Is. 12. - P. 896-901, DOI 10.1134/S0021364022602664. - Cited References: 25 . - ISSN 0021-3640. - ISSN 1090-6487
Аннотация: An approach that makes it possible to correctly derive equations describing the Bose–Einstein condensation and the spectrum of elementary excitations in the ensemble of Hubbard bosons in the strong correlation regime (U≫|tfm|) has been developed in the atomic representation using the Dyson method with the introduced indefinite metric. The kinematic Dyson interaction caused by the properties of the commutation relations of dynamic variables plays an important role in such a system. An effective Hamiltonian has been obtained using the operator form of perturbation theory at finite U values. It has been shown that the properties of the ensemble of Hubbard bosons have been determined by the kinematic interaction, correlated hopping, and the attraction between Hubbard bosons. Numerical calculations have demonstrated the effect of these interactions on the characteristics of the energy spectrum of excitations of the ensemble of Hubbard bosons and on the dependence of the density of condensate particles on the density of bosons in the system.

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Публикация на русском языке Вальков, Валерий Владимирович. Спектр возбуждений в ансамбле бозонов Хаббарда [Текст] / В. В. Вальков // Письма в ЖЭТФ. - 2022. - Т. 116 Вып. 12. - С. 857-862

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Вальков, Валерий Владимирович
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12.

Polukeev, S. I.
Exchange interaction in LaCoO3 between cobalt ions Co3+ in different spin states / S. I. Polukeev, V. A. Gavrichkov, S. G. Ovchinnikov // Phys. Solid State. - 2022. - Vol. 64, Is. 12. - P. 1887-1890, DOI 10.21883/PSS.2022.12.54381.426. - Cited References: 38. - The work was carried out with the financial support of the Russian Foundation for Basic Research (project No. 20-42-240016) . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
superexchange interaction -- magnetic structure -- Hubbard model -- projection operator method -- exchange loop
Аннотация: The values and signs of the contributions to the superexchange interaction of Co3+ ions in LaCoO3 in different spin states, namely, the superexchange of a pair of ions in the intermediate (IS) state and the superexchange of a pair of ions, one of which is in the intermediate state and the other in the high-spin (HS) state, are studied. For this purpose, virtual electron-hole pairs produced in the course of superexchange (the so-called exchange loops) have been studied within the framework of a multiband generalization of the Hubbard model. It is shown that the cobalt ions in the intermediate state are ordered ferromagnetically, while a pair of ions in different HS and IS states makes an AFM contribution to the superexchange.

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Публикация на русском языке Полукеев, Семен Игоревич. Обменное взаимодействие в LaCoO3 между ионами кобальта Co3+ в различных спиновых состояниях [Текст] / С. И. Полукеев, В. А. Гавричков, С. Г. Овчинников // Физ. тверд. тела. - 2022. - Т. 64 Вып. 12. - С. 1916-1919

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Полукеев, Семен Игоревич
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13.

Kolovsky, A. R.
Josephson oscillation in the open two-site Bose-Hubbard system / A. R. Kolovsky // Europhys. Lett. - 2022. - Vol. 139, Is. 5. - Ст. 50002, DOI 10.1209/0295-5075/ac8cae. - Cited References: 39. - The author thanks D. N. Maksimov for fruitful discussions and acknowledges financial support from the Russian Science Foundation through Grant No. 19-12-00167 . - ISSN 0295-5075
Аннотация: We analyze Josephson's oscillation of Bose particles in the open two-site Bose-Hubbard system. First, we excite the system from the vacuum state into a state suitable for observing the oscillation by using a special protocol for external driving. Next, we switch off the driving and observe the oscillation. It is shown that the main mechanism for the decay of Josephson's oscillation is the dephasing due to the fluctuating number of particles in open systems. An analytical estimate for the decay time is obtained.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Коловский, Андрей Радиевич
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14.

Makarov, I. A.
Effect of orthorhombicity on the electronic structure and superconducting properties of high-Tc cuprate family / I. A. Makarov, S. G. Ovchinnikov // J. Supercond. Novel Magn. - 2021. - Vol. 34, Is. 10. - P. 2503-2515, DOI 10.1007/s10948-021-05915-w. - Cited References: 73. - We would like to especially thank A. Bianconi for new ideas, useful discussions, and suggestions. We thank D.M. Dzebisashvili, I.A. Nekrasov, and A.A. Slobodchikov for valuable advice and useful discussions. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project ”Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials” No. 20-42-240016 . - ISSN 1557-1939
Кл.слова (ненормированные):
Cuprate superconductors -- Orthorhombic distortion -- Strong electronic correlations -- Hubbard model -- Electronic structure -- Concentration dependence of Tc
Аннотация: Electronic structure in the normal state and properties in the superconducting state of the orthorhombic phase in HTSC cuprates are studied within the multielectron generalized tight-binding (GTB) approach. The joint effect of variation of average Cu-O distance and orthorhombic distortion on the Fermi contour, band structure, and concentration dependence of Tc is studied. Quasiparticle excitations were constructed within the framework of the five-band p-d model for the layer of the CuO6 octahedra. The electronic structure of quasiparticle excitations in the effective Hubbard model is calculated using the equation of motion for Green’s functions in the generalized mean-field approximation. Orthorhombic distortion leads to asymmetric with respect to the nodal direction of the Brillouin zone dispersion surface of quasiparticle excitations and to splitting of each van Hove singularity into two peaks. Transformation of the Fermi contour from hole pockets to the large hole and electron pockets occurs as a result of two quantum-phase transitions at dopings xc1 and xc2. Simultaneous average Cu-O distance elongation and orthorhombic distortion decreasing result in Tc decrease. Tc dependence on average Cu-O distance in the orthorhombic phase is in agreement with the behavior of experimental Tcmax values when the DOS effect on Tc prevails over the effect of the exchange parameter. There are two Tc maxima in the orthorhombic system with the suppressed exchange parameter, and these maxima appear at concentrations xc1 and xc2.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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15.

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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16.

Val'kov, V. V.
Splitting of the spectrum of fermionic excitations in a topological insulator by charge fluctuations / V. V. Val'kov // JETP Letters. - 2021. - Vol. 114, Is. 12. - P. 751-756, DOI 10.1134/S0021364021240097. - Cited References: 22. - This work was supported by the Russian Foundation for Basic Research (project no. 19-02-00348) . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
HUBBARD FERMIONS
   EDGE STATES
   PHASE
   SURFACE
Аннотация: It is shown that the intersite Coulomb interaction of electrons in a topological insulator leads to the splitting of the initial energy structure and to the induction of two bands of fluctuation states. As a result, the total spectrum of Fermi excitations of the topological insulator has a four-band structure. The dielectric gap is determined by the energy interval between the bottom of the band of fluctuation states of conduction electrons and the top of the valence band of fluctuation states. Since the band of fluctuation states is narrow, quasiparticles with different effective masses appear.

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Публикация на русском языке Вальков, Валерий Владимирович. Расщепление спектра фермиевских возбуждений топологического изолятора зарядовыми флуктуациями [Текст] / В. В. Вальков // Письма в ЖЭТФ. - 2021. - Т. 114 Вып. 12. - С. 812-817

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr KSC, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Вальков, Валерий Владимирович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-02-00348]
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17.

Chaotic and regular dynamics in the three-site Bose-Hubbard model / A. A. Bychek, P. S. Muraev, D. N. Maksimov [et al.] // AIP Conf. Proc. - 2020. - Vol. 2241. - Ст. 020007DOI 10.1063/5.0011540. - Cited References: 30. - This work has been supported through Russian Science Foundation Grant N19-12-00167
Аннотация: We analyze the energy spectrum of the three-site Bose-Hubbard model. It is shown that this spectrum is a mixture of the regular and irregular spectra associated with the regular and chaotic components of the classical Bose-Hubbard model. We find relative volumes of these components by using the pseudoclassical approach. Substituting these values in the Berry-Robnik distribution for the level spacing statistics we obtain good agreement with the numerical data.

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Держатели документа:
L.V. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
M.F. Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Bychek, A. A.; Бычек, Анна Андреевна; Muraev, P. S.; Мураев, Павел Сергеевич; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; International Conference on Quantum Technologies(5th ; 15 - 19 July 2019 ; Moscow)
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18.

Open bose-hubbard chain: pseudoclassical approach / A. A. Bychek, P. S. Muraev, D. N. Maksimov, A. R. Kolovsky // Phys. Rev. E. - 2020. - Vol. 101, Is. 1. - Ст. 012208, DOI 10.1103/PhysRevE.101.012208. - Cited References: 29. - This work has been supported through Russian Science Foundation (RU), N19-12-00167 . - ISSN 2470-0045. - ISSN 2470-0053

РУБ Physics, Fluids & Plasmas + Physics, Mathematical

Аннотация: We analyze the stationary current of bosonic carriers in the Bose-Hubbard chain of length L where the first and the last sites of the chain are attached to reservoirs of Bose particles acting as a particle source and sink, respectively. The analysis is carried out by using the pseudoclassical approach which reduces the original quantum problem to the classical problem for L coupled nonlinear oscillators. It is shown that an increase of oscillator nonlinearity (which is determined by the strength of interparticle interactions) results in a transition from the ballistic transport regime, where the stationary current is independent of the chain length, to the diffusive regime, where the current is inversely proportional to L.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Sch Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Bychek, A. A.; Бычек, Анна Андреевна; Muraev, P. S.; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; Russian Science FoundationRussian Science Foundation (RSF) [N19-12-00167]
}
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19.

Kolovsky, A. R.
Open Fermi-Hubbard model: Landauer's versus master equation approaches / A. R. Kolovsky // Phys. Rev. B. - 2020. - Vol. 102, Is. 17. - Ст. 174310, DOI 10.1103/PhysRevB.102.174310. - Cited References: 22. - The author acknowledges discussions with D. N. Maksimov and financial support of Russian Science Foundation (RU) through Grant No. 19-12-00167 . - ISSN 2469-9950
Кл.слова (ненормированные):
Relaxation processes -- Fermi particles -- Landauer formalisms -- Master equations -- Non equilibrium -- Quantum transport -- Quasimomentum -- Rate of relaxation -- Simple modeling
Аннотация: We introduce a simple model for the quantum transport of Fermi particles between two contacts connected by a lead. It generalizes the Landauer formalism by explicitly taking into account the relaxation processes in the contacts. We calculate the contact resistance and nonequilibrium quasimomentum distribution of the carriers in the lead and show that they strongly depend on the rate of relaxation processes.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Коловский, Андрей Радиевич
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20.

External electric field effect on electronic properties and charge transfer in CoI2/NiI2 spinterface / I. Melchakova [et al.] // Int. J. Quantum Chem. - 2020. - Vol. 120, Is. 3. - Ст. e26092, DOI 10.1002/qua.26092. - Cited References: 27. - Ministry of Education and Science of the Russian Federation, Grant/Award Number: 16.1455.2017/PCh; National Research Foundation of Korea, Grant/Award Number: NRF-2017R1A2B4004440; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, Grant/Award Number: 18-43-243011 . - ISSN 0020-7608. - ISSN 1097-461X

РУБ Chemistry, Physical + Mathematics, Interdisciplinary Applications + Quantum Science & Technology + Physics, Atomic, Molecular & Chemical
Рубрики:
MAGNETIC-PROPERTIES
METAL
EDGE
Кл.слова (ненормированные):
DFT -- electric field -- Hubbard correction -- spintronics -- transition metal dihalides
Аннотация: Electronic structure and spin-related properties of CoI2/NiI2 heterostructure were studied by means of density functional theory. It was shown that the electronic structure at the Fermi level can be characterized by a band gap. The effect of the external electric field on charge transfer and electronic properties of the CoI2/NiI2 interface was investigated, and it was found that band gap width depends on the strength of the applied electric field, switching its nature from semiconducting to a half-metallic one. An easy control of the electronic properties and promising spin-polarized nature of the CoI2/NiI2 spinterface allows the heterostructure to be used in spin-related applications.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia.
Kirensky Inst Phys, Krasnoyarsk, Russia.
Kyungpook Natl Univ, Dept Chem, 80 Daehak Ro, Daegu 41566, South Korea.

Доп.точки доступа:
Melchakova, I.; Мельчакова, Юлия; Kovaleva, E. A.; Ковалева, Евгения Андреевна; Mikhaleva, Natalia S.; Tomilin, F. N.; Томилин, Феликс Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Kuzubov, A. A.; Кузубов, Александр Александрович; Avramov, P. V.; Аврамов, Павел Вениаминович; Ministry of Education and Science of the Russian FederationMinistry of Education and Science, Russian Federation [16.1455.2017/PCh]; National Research Foundation of KoreaNational Research Foundation of Korea [NRF-2017R1A2B4004440]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-43-243011]
}
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