Electron Correlations in Narrow Energy Bands: Ground State Energy and Metal-Insulator Transition

Details Electron Correlations in Narrow Energy Bands: Ground State Energy and Metal-Insulator Transition Electron Correlations in Narrow Energy Bands: Ground State Energy and Metal-Insulator Transition

2000-05-10

arxiv.org/abs/cond-mat/0005175v1

Condens. Matter Phys.-2000.-vol.3, No. 4(24).- p. 787-798

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 11 eps figures, Latex 2.09

Scientific paper

The electron correlations in narrow energy bands are examined in framework of the Hubbard model. The single-particle Green function and energy spectrum are obtained in paramagnetic state at half-filling by means of new two-pole approximation. In the ground state analitical expressions for the energy gap, polar states concentration and energy of the system are found. Metal-insulator transitions in the model at change of bandwidth or temperature are investigated. The obtained results are used for interpretation of some experimental data in narrow-band materials.

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