Thermal and Dynamical Properties of the Two-band Hubbard Model Compared with FeSi
| Autor: | Kentaro Urasaki, Tetsuro Saso |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Physics
Condensed matter physics Hubbard model Strongly Correlated Electrons (cond-mat.str-el) Band gap Kondo insulator FOS: Physical sciences Conductivity Optical conductivity Condensed Matter - Strongly Correlated Electrons Thermal Condensed Matter::Strongly Correlated Electrons Perturbation theory Spin-½ |
| DOI: | 10.48550/arxiv.cond-mat/9803010 |
| Popis: | We study the two-band Hubbard model introduced by Fu and Doniach as a model for FeSi which is suggested to be a Kondo insulator. Using the self-consistent second-order perturbation theory combined with the local approximation which becomes exact in the limit of infinite dimensions, we calculate the specific heat, the spin susceptibility and the dynamical conductivity and point out that the reduction of the energy gap due to correlation is not significant in contrast to the previous calculation. It is also demonstrated that the gap at low temperatures in the optical conductivity is filled up at a rather low temperature than the gap size, which is consistent with the experiment. Comment: 6 pages, LaTeX, 7 PS figures included, uses RevTeX |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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