Correlated hopping in the Falicov-Kimball model: A large-dimensions study

Article

关键词: BOND-CHARGE INTERACTION;    HOLE SUPERCONDUCTIVITY;    HUBBARD-MODEL;    FERMIONS;    THERMODYNAMICS;    SYSTEMS;    LATTICE;   

DOI  :  10.1103/PhysRevB.60.15660

来源: SCIE

【 摘 要 】

The Falicov-Kimball model with a correlated-hopping interaction is solved using an extended dynamical mean-field theory that becomes exact in the limit of large dimensions. The effect of correlated hopping is to introduce nonlocal self-energy components that retain full dynamics as D-->infinity, thus introducing an explicit k dependence to the single-particle self-energy. An explicit solution for the homogeneous phase at D=2 reveals significant nonlocal dynamical contributions in the physically relevant regime of a moderately large correlated-hopping amplitude, indicating that important nonlocal correlations are omitted in Hubbard-like models upon neglecting the correlated-hopping interaction. [S0163-1829(99)02047-0].

【 授权许可】

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