Lower subband splitting and superconductivity of 2D Hubbard fermions with strong intersite correlations |
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| Authors: | V. V. Val’kov M. M. Korovushkin |
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| Affiliation: | 1.Kirensky Institute of Physics,Russian Academy of Sciences, Siberian Branch,Krasnoyarsk,Russia;2.Siberian State Aerospace University,Krasnoyarsk,Russia |
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| Abstract: | The effect of the strong intersite Coulomb correlations on the formation of an electron structure in the Shubin-Vonsowsky model in the regime of strong one-site correlations is studied. The results reveal a split-off band of the Fermi states. The spectral intensity of this band grows with the enhancement of the doping level and is determined by the mean-square fluctuation of occupation numbers. This changes the structure of the electron density of states qualitatively. |
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