Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
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Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data
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| Creator |
Zubov, E.E.
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К 30-летию открытия высокотемпературной сверхпроводимости
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| Description |
An influence of the electron-phonon interaction on excitation spectrum and damping in a narrow band electron subsystem of cuprates has been investigated. Within the framework of the t-J model an approach to solving a problem of account of both strong electron correlations and local electron–phonon binding with characteristic Einstein mode ω ₀ in the normal state has been presented. In approximation Hubbard-I it was found an exact solution for the polaron bands. We established that in the low-dimensional system with a pure kinematic part of Hamiltonian a complicated excitation spectrum is realized. It is determined mainly by peculiarities of the lattice Green's function. In the definite area of the electron concentration and hopping integrals a correlation gap may be possible on the Fermi level. Also, in specific cases it is observed a doping evolution of the Fermi surface. We found that the strong electron–phonon binding enforces a degree of coherence of electron-polaron excitations near the Fermi level and spectrum along the nodal direction depends on wave vector module weakly. It corresponds to ARPES data. A possible origin of the experimentally observed kink in the nodal direction of cuprates is explained by fine structure of the polaron band to be formed near the mode −ω₀.
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| Date |
2018-01-18T18:22:29Z
2018-01-18T18:22:29Z 2016 |
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| Type |
Article
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| Identifier |
Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data / E.E. Zubov // Физика низких температур. — 2016. — Т. 42, № 11. — С. 1328-1344. — Бібліогр.: 24 назв. — англ.
0132-6414 PACS: 79.60.–i, 74.72.–h, 71.27.+a, 71.38.–k http://dspace.nbuv.gov.ua/handle/123456789/129323 |
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en
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Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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