DRUDE WEIGHT AND DC CONDUCTIVITY OF CORRELATED ELECTRONS

被引：12

作者：

UHRIG, G ^{[1
]}

VOLLHARDT, D ^{[1
]}

机构：

[1] RHEIN WESTFAL TH AACHEN,INST THEORET PHYS C,D-52056 AACHEN,GERMANY

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.52.5617

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页码：5617 / 5623

页数：7

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