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Nikolaev, S. V.
Cluster perturbation theory in Hubbard model exactly taking into account the short-range magnetic order in 2 x 2 cluster / S. V. Nikolaev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2010. - Vol. 111, Is. 4. - P. 635-644, DOI 10.1134/S1063776110100146. - Cited References: 23. - The authors thank V. V. Val'kov for fruitful discussions of this work. This research was supported financially by the Russian Foundation for Basic Research (project nos. 09-02-90723-mob_st and 09-02-00127) and by program no. 5.7 of the Presidium of the Russian Academy of Sciences and integration project no. 40 of the Siberian Branch and Ural Division of the Russian Academy of Sciences. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
INFINITE DIMENSIONS
SYSTEMS
STATE
Кл.слова (ненормированные):
Antiferromagnetic orders -- Characteristic energy -- Cluster perturbation theories -- Coulomb repulsions -- Density of state -- Dynamic mean field theories -- Eigenvalue problem -- Exact diagonalization -- Excited levels -- Finite temperatures -- Half-filling -- Hubbard -- Metal insulator transition temperature -- Nearest neighbors -- Numerical solution -- Pseudo-gap -- Quasiparticle spectrum -- Shadow zone -- Short-range magnetic orders -- Temperature evolution -- Zero temperatures -- Antiferromagnetism -- Eigenvalues and eigenfunctions -- Fermi level -- Hubbard model -- Mean field theory -- Metal insulator boundaries -- Perturbation techniques -- Semiconductor insulator boundaries -- Statistical mechanics -- Metal insulator transition
Аннотация: The cluster perturbation theory is presented in the 2D Hubbard model constructed using X operators in the Hubbard-I approximation. The short-range magnetic order is taken into account by dividing the entire lattice into individual 2 x 2 clusters and solving the eigenvalue problem in an individual cluster using exact diagonalization taking into account all excited levels. The case of half-filling taking into account jumps between nearest neighbors is considered. As a result of numerical solution, a shadow zone is discovered in the quasiparticle spectrum. It is also found that a gap in the density of states in the quasiparticle spectrum at zero temperature exists for indefinitely small values of Coulomb repulsion parameter U and increases with this parameter. It is found that the presence of this gap in the spectrum is due to the formation of a short-range antiferromagnetic order. An analysis of the temperature evolution of the density of states shows that the metal-insulator transition occurs continuously. The existence of two characteristic energy scales at finite temperatures is demonstrated, the larger scale is associated with the formation of a pseudogap in the vicinity of the Fermi level, and the smaller scale is associated with the metal-insulator transition temperature. A peak in the density of states at the Fermi level, which is predicted in the dynamic mean field theory in the vicinity of the metal-insulator transition, is not observed.

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Держатели документа:
[Nikolaev, S. V.
Ovchinnikov, S. G.] Russian Acad Sci, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Nikolaev, S. V.] Dostoevsky State Univ, Omsk 644077, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Dostoevsky State University, Omsk 644077, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Sandalov, I. S.
Coulomb interaction and lattice theory of strongly correlated systems .1. mean field-equations for equilibrium positions of ions and band-structure / I. S. Sandalov, V. I. Filatjev // Physica B. - 1990. - Vol. 162, Is. 2. - P. 139-160, DOI 10.1016/0921-4526(90)90046-W. - Cited References: 31 . - ISSN 0921-4526

РУБ Physics, Condensed Matter

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Доп.точки доступа:
Filatjev, V. I.; Сандалов, Игорь Семёнович
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Sandalov, I. S.
Coulomb interaction and lattice theory of strongly correlated systems .2. dynamic matrix, electron-boson and effective electron-electron interactions / I. S. Sandalov, V. I. Filatjev // Physica B. - 1990. - Vol. 162, Is. 2. - P. 161-171, DOI 10.1016/0921-4526(90)90047-X. - Cited References: 13 . - ISSN 0921-4526

РУБ Physics, Condensed Matter

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Доп.точки доступа:
Filatjev, V. I.; Сандалов, Игорь Семёнович
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Kagan, M. Yu..
Coulomb interactions-induced perfect spin-filtering effect in a quadruple quantum-dot cell / M. Y. Kagan, V. V. Val'kov, S. V. Aksenov // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 15-18, DOI 10.1016/j.jmmm.2016.12.106. - Cited References:29. - We acknowledge fruitful discussions with P.I. Arseyev, N.S. Maslova, V.N. Mantsevich and R.Sh. Ikhsanov. This work was supported by the Comprehensive programme SB RAS no. 0358-2015-0007, the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects nos. 15-02-03082, 16-42-243056, 16-42-242036, 17-42-240441. M.Yu.K. thanks the Program of Basic Research of the National Research University Higher School of Economics for support. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPINTRONICS
TRANSPORT
MODEL
Кл.слова (ненормированные):
Spin filter -- Quantum interference -- Fano-Feshbach resonance -- Coulomb -- correlations
Аннотация: A quadruple quantum-dot (QQD) cell is proposed as a spin filter. The transport properties of the QQD cell were studied in linear response regime on the basis of the equations of motion for retarded Green's functions. The developed approach allowed us to take into account the influence of both intra-and interdot Coulomb interactions on charge carriers' spin polarization. It was shown that the presence of the insulating bands in the conductance due to the Coulomb correlations results in the emergence of spin-polarized windows (SPWs) in magnetic field leading to the high spin polarization. We demonstrated that the SPWs can be effectively manipulated by gate fields and considering the hopping between central dots in both isotropic and anisotropic regimes.

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Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Aksenov, S. V.; Аксенов, Сергей Владимирович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
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Coulomb repulsion of holes and competition between dx2−y2 -wave and s-wave parings in cuprate superconductors / V. V. Val'kov [et al.] // J. Exp. Theor. Phys. - 2017. - Vol. 125, Is. 5. - P. 810-821, DOI 10.1134/S1063776117110085. - Cited References: 51. - This work was supported by the Russian Foundation for Basic Research, the Government of Kras-noyarsk Region, the Krasnoyarsk Region Science and Technology Support Fund (project nos. 16-42-240435, 16-42-243056, and 16-42-243057), and the Program by the Siberian Branch, Russian Academy of Sciences (project no. 356-2015-0406). The work of A.F.B. was supported by the Russian Foundation for Basic Research (project no. 16-02-00304). The work of M.M.K. was supported by the Council for Grants of the President of the Russian Federation (MK-1398.2017.2). . - ISSN 1063-7761
Кл.слова (ненормированные):
Cooper instability -- Coulomb repulsions -- Crystallographic structure -- Inter-site coulomb interactions -- Order parameter symmetry -- Quasiparticles -- Self-consistency equations -- Super conducting phasis
Аннотация: The effect of the Coulomb repulsion of holes on the Cooper instability in an ensemble of spin–polaron quasiparticles has been analyzed, taking into account the peculiarities of the crystallographic structure of the CuO2 plane, which are associated with the presence of two oxygen ions and one copper ion in the unit cell, as well as the strong spin–fermion coupling. The investigation of the possibility of implementation of superconducting phases with d-wave and s-wave of the order parameter symmetry has shown that in the entire doping region only the d-wave pairing satisfies the self-consistency equations, while there is no solution for the s-wave pairing. This result completely corresponds to the experimental data on cuprate HTSC. It has been demonstrated analytically that the intersite Coulomb interaction does not affect the superconducting d-wave pairing, because its Fourier transform Vq does not appear in the kernel of the corresponding integral equation.

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Публикация на русском языке Кулоновское отталкивание дырок и конкуренция dx2-y2- и s-спариваний в купратных сверхпроводниках [Текст] / В. В. Вальков [и др.] // Журн. эксперим. и теор. физ. - 2017. - Т. 152 Вып. 5. - С. 957-969

Держатели документа:
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center,”, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Reshetnev Siberian State University of Science and Technologies, Krasnoyarsk, Russian Federation
Vereshchagin Institute of High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.
}
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    Komarov, K. K.
    Effect of Coulomb repulsion on the London penetration depth in cuprate superconductors / K. K. Komarov, D. M. Dzebisashvili // Phys. Scr. - 2020. - Vol. 95, Is. 6. - Ст. 065806, DOI 10.1088/1402-4896/ab8163. - Cited References: 57. - The work was financially supported by the Russian Foundation for Basic Research (project #18-02-00837, #20-32-70059), the Government of Krasnoyarsk Region, the Krasnoyarsk Regional Science and Technology Support Fund (projects: #18-42-240014 'One-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors' and #18-42-243002 'Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors'). The work of KKK was supported by the Council for Grants of the President of the Russian Federation (project MK-1641.2020.2). . - ISSN 0031-8949. - ISSN 1402-4896
Рубрики:
ELECTRONIC-STRUCTURE
   SUPERFLUID DENSITY
   QUASI-PARTICLES
   2-BAND MODEL
Кл.слова (ненормированные):
strongly correlated electron systems -- Mott-Hubbard materials -- high-temperature superconductivity -- spin-charge coupling -- Coulomb repulsion -- London penetration depth
Аннотация: We study the effect of Coulomb repulsion between oxygen holes on the London penetration depth λ based on the concept of spin-polaron nature of Fermi quasiparticles in cuprates superconductors. It is shown that for the generally accepted values of the parameters of the spin-fermion model, taking into account the Coulomb interaction, both the one-site Hubbard U p and interaction between holes on the next-nearest-neighbor oxygen ions V 2, allows one to achieve a much better agreement of the calculated temperature dependencies of the value λ −2 with the experimental data in La2−x Sr x CuO4 in a wide range around optimal doping.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Комаров, Константин Константинович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00837, 20-32-70059]; Government of Krasnoyarsk Region; Krasnoyarsk Regional Science and Technology Support Fund [18-42-240014, 18-42-243002]; Council for Grants of the President of the Russian Federation [MK-1641.2020.2]
}
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    Komarov, K. K.
    Effect of Coulomb repulsion on the London penetration depth in cuprate superconductors / K. K. Komarov, D. M. Dzebisashvili. - Electronic text data // ArXiv. - 2019. - Ст. 1912.04577. - Cited References: 55. - The work was financially supported by the Presidium of the Russian Academy of Sciences the Program No.12 ”Fundamental problems of high-temperature superconductivity”, the Russian Foundation for Basic Research (project #18-02-00837, #20-32-70059), the Government of Krasnoyarsk Region, the Krasnoyarsk Regional Science and Technology Support Fund (projects: #18-42-240014 ”One-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors” and #18-42-243002 ”Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors”). The work of K.K.K. was supported by the Council for Grants of the President of the Russian Federation (project MK-3722.2018.2).
Рубрики:
Superconductivity
   Strongly Correlated Electrons
Кл.слова (ненормированные):
strongly correlated electron systems -- Mott-Hubbard materials -- high-temperature superconductivity -- spin-charge coupling -- Coulomb repulsion -- London penetration depth
Аннотация: We study the effect of Coulomb repulsion between oxygen holes on the London penetration depth λ based on the concept of spin-polaron nature of Fermi quasiparticles in cuprates superconductors. It is shown that for the generally accepted values of the parameters of the spin-fermion model, taking into account the Coulomb interaction, both the one-site Hubbard Up and interaction between the holes on next-nearest-neighbor oxygen ions V2, allows one to achieve a much better agreement of the calculated temperature dependencies of the value λ−2 with the experimental data in La2−xSrxCuO4 with optimal doping.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS 660036, Krasnoyarsk, Russia
Reshetnev Siberian State University of Science and Technology 660037, Krasnoyarsk, Russia

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Комаров, Константин Константинович
}
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Val'kov, V. V.
Effect of interstitial Coulomb interaction on the occurrence of a gapless superconducting phase of Hubbard fermions on a triangular lattice / V. V. Val’kov, T. A. Val’kova, V. A. Mitskan // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 6. - P. 612-615, DOI 10.3103/S1062873816060393. - Cited References: 10 . - ISSN 1062-8738
Кл.слова (ненормированные):
Physics -- Concentration dependence -- Coordination sphere -- Hubbard -- Nodal points -- Quantum transitions -- Superconducting order parameters -- Superconducting phase -- Triangular lattice -- Coulomb interactions
Аннотация: The concentration dependence of the position of nodal points of a superconducting order parameter is investigated using the t–J–V model for a triangular lattice with regard to the exchange and Coulomb interactions in two coordination spheres. The conditions for a topological quantum transition are established. © 2016, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Влияние межузельного кулоновского взаимодействия на реализацию бесщелевой сверхпроводящей фазы фермионов хаббарда на треугольной решетке [Текст] / В. В. Вальков, Т. А. Валькова, В. А. Мицкан // Изв. РАН. Сер. физич. - 2016. - Т. 80 № 6. - С. 679-682

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Val’kova, T. A.; Валькова, Татьяна Александровна; Mitskan, V. A.; Мицкан, Виталий Александрович; Вальков, Валерий Владимирович
}
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Effect of local coulomb interaction on majorana corner modes / S. V. Aksenov, A. D. Fedoseev, M. S. Shustin, A. O. Zlotnikov // 8th International conference on supercondactivity and magnetism (ICSM2023) : abstract book. - 2023. - P. 454. - Cited References: 4. - РНФ № 22-22-20076

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Держатели документа:
Kirensky Institute of Physics, FRC KSC SB RAS

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; International Conference on Supercondactivity and Magnetism(8 ; 2023 ; May 4-11 ; Ölüdeniz-Fethiye, Turkey)
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10.

Effect of local Coulomb interaction on Majorana corner modes: Weak and strong correlation limits / S. V. Aksenov, A. D. Fedoseev, M. S. Shustin, A. O. Zlotnikov // Phys. Rev. B. - 2023. - Vol. 107, Is. 12. - Ст. 125401, DOI 10.1103/PhysRevB.107.125401. - Cited References: 63. - We acknowledge fruitful discussions with D. M. Dzebisashvili and V. A. Mitskan. The reported study was supported by Russian Science Foundation Project No. 22-22-20076, and Krasnoyarsk Regional Fund of Science . - ISSN 2469-9950. - ISSN 2469-9969
Аннотация: Here we present an analysis of the evolution of Majorana corner modes realizing in a two-dimensional higher-order topological superconductor (HOTSC) on a square lattice under the influence of local Coulomb repulsion. Both weak- and strong-interaction regimes are studied. It is shown that in the homogeneous system, the weak repulsion widens the region of the topologically nontrivial phase on the phase diagram. The open-boundary effect, resulting in spatial inhomogeneity of the system, leads to the appearance of the ground-state crossover as the repulsion intensity increases. Before the crossover, concentration correlators are C4 symmetric and spin independent, and the corner states have energies that are determined by the overlap of the excitation wave functions localized at the different corners. After the crossover, the concentration correlators are spin dependent and possess the spontaneously broken symmetry. In turn, the corner excitation energy is size independent and defined by the Coulomb repulsion intensity with a quadratic law. In the strong-repulsion regime we derive the effective HOTSC Hamiltonian in the atomic representation and found a rich variety of interactions induced by virtual processes between the lower and upper Hubbard subbands. It is shown that Majorana corner modes still can be realized in the limit of the infinite repulsion, although the boundaries of the topologically nontrivial phase are strongly renormalized by Hubbard corrections.

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