Renormalized Thermal Distribution Function in an Interacting Electron-Phonon System

31 May 1982

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 48 (22) , 1548-1551
https://doi.org/10.1103/physrevlett.48.1548

Abstract

The electron-phonon interaction is used to demonstrate the important effect of interactions on the electronic distribution function at finite temperature. It is shown that the usual picture of "thermal (Fermi) smearing" is a greatly oversimplified one. The distribution function resulting from an Einstein spectrum with various coupling strengths is presented and interpreted, and an exact expression for the spin susceptibility is used to illustrate the utility of this novel viewpoint for thermodynamics.

Keywords

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