DRUDE WEIGHT AND DC CONDUCTIVITY OF CORRELATED ELECTRONS

Article

关键词: DIMENSIONAL HUBBARD-MODEL;    INFINITE DIMENSIONS;    FERMION SYSTEMS;    MOTT TRANSITION;    TRANSPORT-PROPERTIES;    RESISTIVITY;    DISORDER;    LATTICE;   

DOI  :  10.1103/PhysRevB.52.5617

来源: SCIE

【 摘 要 】

The Drude weight D and the de conductivity sigma(dc)(T) of strongly correlated electrons are investigated theoretically. Analytic results are derived for the homogeneous phase of the Hubbard model at d = infinity, and for spinless fermions in this limit with 1/d corrections systematically included to lowest order. It is found that sigma(dc)(T) is finite for all T > 0, displaying Fermi-liquid behavior, sigma(dc) proportional to 1/T-2, at low temperatures. The validity of this result for finite dimensions is examined by investigating the importance of umklapp scattering processes and vertex corrections. A finite dc conductivity for T > 0 is argued to be a generic feature of correlated lattice electrons in not too low dimension.

【 授权许可】

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