Thermal and dynamical properties of the two-band Hubbard model compared with FeSi

Article

关键词: STRONGLY CORRELATED INSULATOR;    INFINITE DIMENSIONS;    OPTICAL-PROPERTIES;    GAP FORMATION;    TEMPERATURE;    TRANSPORT;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.58.15528

来源: SCIE

【 摘 要 】

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 that is justified 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 lower temperature than the gap size, which is consistent with the experiment. [S0163-1829(98)05247-3].

【 授权许可】

Free