期刊
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
卷 112, 期 1, 页码 108-120出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1063776110061056
关键词
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资金
- Presidium of the Russian Academy of Sciences
- Russian Foundation for Basic Research [10-02-00251]
- Scientific and Scientific-Pedagogical Personnel of Innovational Russian for Federal Goal-Oriented Program
- Siberian Branch of the Russian Academy of Sciences [53]
The diagram technique for Hubbard operators is used to investigate the influence of intersite Coulomb interactions on the energy structure and Cooper instability of strongly correlated fermions. Allowance for intersite correlations in doped Mott-Hubbard insulators is shown to lead to a splitting of the lower subband of Hubbard fermions and to the formation of a band of fluctuation states as soon as the intersite interaction energy becomes comparable to or exceeds the mean kinetic energy. The spectral intensity of the splitoff band is proportional to the root-mean-square fluctuation of the occupation numbers and increases with doping level. The predicted effect changes significantly the structure of the density of electronic states. This leads to a renormalization of the pole of the scattering amplitude in the Cooper channel and manifests itself as a nonuniform (in electron concentration) modification of the dependence of the critical superconducting transition temperature.
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