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Temperature-Induced Metal-Insulator Transition in a Narrow-Band Model with Non-Equivalent Hubbard Subbands at Half-Filling | | Leonid Didukh
; Vasyl Hankevych
; | | Date: |
19 Nov 1998 | | Journal: | Condensed Matter Physics, vol. 2, No. 3(19), p. 447-452 (1999) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | Ternopil State Technical University, Ukraine | | Abstract: | In the previous papers (Journ. of Phys. Stud. 2, 362 (1998); cond-mat/9811213) we have studied metal-insulator transition in a generalized Hubbard model with correlated hopping at half-filling and zero temperature. The present paper is devoted to a further study of metal-insulator transition in this model,in particular, an investigation of temperature-induced metal-to-insulator transition. The dependence of energy gap on concentration of doubly occupancy leads to increasing energy gap width with increase of temperature. Thus narrow-band system can undergo transition from a metallic state to an insulating state with the increase of temperature. For some values of intra-atomic Coulomb repulsion $U$ and $w_0$ ($w_0$ is half-bandwidth) we find the values of temperature when narrow-band material undergoes transition from a metallic state to an insulating state. We show that at given $U/w_0$ metal-insulator transition in model with non-equivalent Hubbard sub-bands can occur at smaller temperature than in the Hubbard model. It testifies on the fact that taking into account of correlated hopping is important for a consideration of metal-insulator transition problem. | | Source: | arXiv, cond-mat/9811285 | | Services: | Forum | Review | PDF | Favorites | |
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