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Nikolaev, S. V.
Anomalous spectral properties of high-Tc cuprates: influence of short-range correlations / S. V. Nikolaev, V. I. Kuz'min, S. G. Ovchinnikov // International school/workshop on actual problems of condensed matter physics : Program. Book of abstracts / ed. S. G. Ovchinnikov. - Norilsk, 2018. - P. 21 . - ISBN 978-5-904603-08-3

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Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Ovchinnikov, S. G.; Николаев, Сергей Викторович; Federal Research Center KSC SB RAS; Kirensky Institute of Physics; Research Institute of Agriculture and Ecology of the Arctic; Siberian Federal Univercity
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Anomalous spectral properties of strongly correlated systems within the cluster perturbation theory / V. I. Kuz'min, S. V. Nikolaev, S. G. Ovchinnikov // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст. I.P9. - P. 151-152. - Cited References: 4. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the research project no. 18-32-00256, RFBR and Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: “18-42-240017 Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations” and the research project: “18-42-243004 New thermoelectric materials based on multi-scale spatially inhomogeneous substituted rare-earth cobalt oxides and the Ruddlesden-Popper phases” . - ISBN 978-5-9500855-7-4

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

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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Kuz'min, V. I.
Comparison of the electronic structure of the Hubbard and t - J models within the cluster perturbation theory / V. I. Kuz'min, S. V. Nikolaev, S. G. Ovchinnikov // Phys. Rev. B. - 2014. - Vol. 90, Is. 24. - Ст. 245104, DOI 10.1103/PhysRevB.90.245104. - Cited References: 37. - This work is supported by RFBR (Grants No. 13-02-01395-a, No. 14-02-31677-mol-a, and No. 14-02-00186-a), the Ministry of Education and Science of Russia (Government Contract No. 3085, SibFU 2014 GF-2), and a grant of the Russian President (Grant No. NSh-2886.2014.2). . - ISSN 1098-0121. - ISSN 1550-235X

РУБ Physics, Condensed Matter
Рубрики:
FERMION SYSTEMS
SUPERCONDUCTIVITY
METAL
Аннотация: Electronic dispersion and density of states (DOS) have been calculated for the Hubbard model and the t−J and t−J∗ models with three-site correlated hopping by the cluster perturbation theory. We have found a rather strong quantitative difference both in dispersion and DOS at all doping for the Hubbard and t−J models at the energy scale ω≳t. The three-site correlated hopping addition results in an almost negligible difference for the Hubbard and t−J∗ models. Close to the Fermi energy, at the scale ω≲J, the electronic structure of all three models is similar. We have found the line of zeros of the Green function for the t−J model that has been previously obtained for the Hubbard model by cellular dynamical mean-field theory calculations.

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Держатели документа:
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович; RFBR [13-02-01395-a, 14-02-31677-mol-a, 14-02-00186-a]; Ministry of Education and Science of Russia [3085, SibFU 2014 GF-2]; [NSh-2886.2014.2]
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Kuz'min, V. I.
Comparison of the electronic structure of the Hubbard and t-J models within the cluster perturbation theory / V. I. Kuz’min, S. V. Nikolaev, S. G. Ovchinnikov // Пятая Междунар. конф. "Фундаментал. проблемы высокотемператур. сверхпроводимости" (ФПС’15) : сборник расширенных тезисов. - М. : ФИАН, 2015. - Ст. M7. - С. 58-59

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Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович; "Фундаментальные проблемы высокотемпературной сверхпроводимости", Международная конференция(5 ; 2015 ; окт. ; 5-9 ; Малаховка, Моск. обл.); Российская академия наук; Физический институт им. П.Н. Лебедева РАН; Научный совет по физике конденсированного состояния РАН; Научный совет по физике низких температур РАН
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Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model [Preprint] / V. I. Kuz'min, M. A. Visotin, S. V. Nikolaev, S. G. Ovchinnikov. - Electronic text data // ArXiv. - 2020. - Ст. 2001.05143. - Cited References: 86. - The reported study was funded by RFBR according to the research project No. 18-32-00256 (all the results concerning the influence of short-range correlations on the electronic spectral properties). The reported study was also funded by Russian Foundation for Basic Research and Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects “Electronic correlation effects and multiorbital physics in iron-based materials and cuprates” number 19-42-240007, and “Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations” number 18-42-240017
Рубрики:
Strongly Correlated Electrons
Аннотация: Cluster perturbation theory is applied to the two-dimensional Hubbard t−t′−t′′−U model to obtain doping and temperature dependent electronic spectral function with 4×4 and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I like electronic dispersion becomes more pronounced, the Fermi arc turns into large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects.

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

Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Visotin, M. A.; Высотин, Максим Александрович; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model / V. I. Kuz'min, M. A. Visotin, S. V. Nikolaev, S. G. Ovchinnikov // Phys. Rev. B. - 2020. - Vol. 101, Is. 11. - Ст. 115141, DOI 10.1103/PhysRevB.101.115141. - Cited References: 97. - The reported study was funded by RFBR according to Research Project No. 18-32-00256 (all the results concerning the influence of short-range correlations on the electronic spectral properties). The reported study was also funded by RFBR according to Research Project No. 18-32-01062; the Russian Foundation for Basic Research and Government of Krasnoyarsk Territory, the Krasnoyarsk Regional Fund of Science to the Research Projects "Electronic correlation effects and multiorbital physics in iron-based materials and cuprates" No. 19-42-240007 and "Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations" No. 18-42-240017. . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
QUASI-PARTICLE DISPERSION
   FERMI-SURFACE
   QUANTUM OSCILLATIONS
   LANCZOS METHOD
Аннотация: Cluster perturbation theory is applied to the two-dimensional Hubbard t - t' - t '' - U model to obtain doping and temperature-dependent electronic spectral function with 4 x 4 and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I-like electronic dispersion becomes more pronounced, the Fermi arc turns into a large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Visotin, M. A.; Высотин, Максим Александрович; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; RFBRRussian Foundation for Basic Research (RFBR) [18-32-00256, 18-32-01062]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [19-42-240007, 18-42-240017]
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Kuz'min, V. I.
Effect of canted antiferromagnetic order on the electronic structure in the t–J* model within the cluster perturbation theory / V. I. Kuz’min, S. V. Nikolaev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2016. - Vol. 123, Is. 3. - P. 511-519, DOI 10.1134/S1063776116090065. - Cited References: 50. - We are grateful to V.V. Val’kov for stimulating discussions. This work was supported by the Russian Science Foundation (project no. 14-12-00061) . - ISSN 1063-7761
Кл.слова (ненормированные):
Antiferromagnetism -- Electronic structure -- High temperature superconductors -- Magnetic fields -- Antiferromagnetic orderings -- Cluster perturbation theories -- Electron-doping -- External fields -- External magnetic field -- Non-monotonic dependence -- Short-range correlations -- Spectral weight -- Perturbation techniques
Аннотация: The electronic structure in the two-dimensional t–J* model with canted antiferromagnetic order in an external magnetic field has been calculated within the cluster perturbation theory. In zero external field, the evolution of the Fermi surface with n-type doping has been obtained in good agreement with experimental data on cuprate superconductors. It has been shown that the inclusion of short-range correlations can result in a nonmonotonic dependence of the spectral weight distribution at the Fermi level on the external magnetic field. In contrast to the case of electron doping, such changes in the case of hole doping can be expected at experimentally achievable fields. © 2016, Pleiades Publishing, Inc.

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Публикация на русском языке Кузьмин, Валерий Ипполитович. Влияние скошенного антиферромагнитного порядка на электронную структуру в t-J*-модели в рамках кластерной теории возмущений [Текст] / В. И. Кузьмин, С. В. Николаев, С. Г. Овчинников // Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 150 Вып. 3. - С. 592-601

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

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович
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Kuz'min, V. I.
Effect of short-range correlations on spectral properties of doped Mott insulators / V. Kuz’min, S. Nikolaev, S. Ovchinnikov // J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 7. - P. 1909-1919, DOI 10.1007/s10948-018-4927-x. - Cited References: 81. - The reported study was funded by RFBR according to the research project no. 18-32-00256 (all the results except correlation functions calculated using 4 × 4 clusters). The study also was funded by the Presidium RAS program no. 12 “Fundamental problems of high temperature superconductivity” (research project 0356-2018-0063); “BASIS” Foundation for Development of Theoretical Physics and Mathematics; RFBR according to the research project no. 16-02-00098; RFBR and Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, the research project: “18-42-240017 Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations” and the research project 18-42-243004. . - ISSN 1557-1939
Кл.слова (ненормированные):
The Hubbard model -- The Hubbard-Holstein model -- HTSC -- Cluster perturbation theories -- Fermi surface -- Spectral properties
Аннотация: In the framework of the cluster perturbation theory for the 2D Hubbard and Hubbard-Holstein models at low hole doping, we have studied the effect of local and short-range correlations in strongly correlated systems on the anomalous features in the electronic spectrum by investigating the fine structure of quasiparticle bands. Different anomalous features of spectrum are obtained as the result of intrinsic properties of strongly correlated electron and polaron bands in the presence of short-range correlations. Particularly, features similar to the electron-like Fermi-pockets of cuprates at hole doping p ∼ 0.1 are obtained without ad hoc introducing a charge density wave order parameter within the Hubbard model in a unified manner with other known peculiarities of the pseudogap phase like Fermi-arcs, pockets, waterfalls, and kink-like features. The Fermi surface is mainly formed by dispersive quasiparticle bands with large spectral weight, formed by coherent low-energy exications. Within the Hubbard-Holstein model at moderate phonon frequencies, we show that modest values of local electron-phonon interaction are capable of introducing low-energy kink-like features and affecting the Fermi surface by hybridization of the fermionic quasiparticle bands with the Franck-Condon resonances.

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

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович
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10.

Effect of the electron-phonon interaction on the formation of the exciton phase in strongly correlated systems with the spin crossover / Yu. S. Orlov, S. V. Nikolaev, V. I. Kuz'min, S. G. Ovchinnikov // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. H : Magnetism of strongly correlated electron systems. - Ст. H.P15. - P. 104-105. - Cited References: 4. - The study was supported by the Russian Scientiʅc Foundation, the Krasnoyarsk Regional Fund of Science, grant No. 22-22-20007 . - ISBN 978-5-94469-051-7

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

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; 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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