Zero-frequency anomaly in quasiclassical ac transport: Memory effects in a two-dimensional metal with a long-range random potential or random magnetic field

URN to cite this document:: urn:nbn:de:bvb:355-epub-462511
DOI to cite this document:: 10.5283/epub.46251

Wilke, J. ; Mirlin, A. D. ; Polyakov, D. G. ; Evers, Ferdinand

; Wölfle, P.

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Date of publication of this fulltext: 05 Jul 2021 06:25

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Abstract

We study the low-frequency behavior of the ac conductivity σ(ω) of a two-dimensional fermion gas subject to a smooth random potential (RP) or random magnetic field (RMF). We find a nonanalytic ∝|ω| correction to Reσ, which corresponds to a 1/t2 long-time tail in the velocity correlation function. This contribution is induced by return processes neglected in Boltzmann transport theory. The ...