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Electron Correlations in Narrow Energy Bands: Ground State Energy and Metal-Insulator Transition | | Leonid Didukh
; Yuriy Skorenkyy
; | | Date: |
10 May 2000 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | Ternopil State Technical University, Ukraine | | Abstract: | 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. | | Source: | arXiv, cond-mat/0005175 | | Services: | Forum | Review | PDF | Favorites | |
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