Electrical Conductivity of Fermi Liquids. I. Many-body Effect on the Drude Weight

Abstract

On the basis of the Fermi liquid theory, we investigate the many-body effect on the Drude weight. In a lattice system, the Drude weight $D$ is modified by electron-electron interaction due to Umklapp processes, while it is not renormalized in a Galilean invariant system. This is explained by showing that the effective mass $m^{\prime }$ for $D\propto n/m^{\prime }$ is defined through the current, not velocity, of quasiparticle. It is shown that the inequality $D>0$ is required for the stability against the uniform shift of the Fermi surface. The result of perturbation theory applied for the Hubbard model indicates that $D$ as a function of the density $n$ is qualitatively modified around half filling $n\sim 1$ by Umklapp processes.

arXiv comment20 pages, 2 figures; J. Phys. Soc. Jpn. Vol.67, No.8

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