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submitted to PRL Logarithmic Temperature Dependence of Conductivity at Half Filled Landau Level

By D. V. Khveshchenko

Abstract

We study temperature dependence of diagonal conductivity at half filled Landau level by means of the theory of composite fermions in the weakly disordered regime (kFl>> 1). At low temperatures we find the leading log T correction resulting from interference between impurity scattering and gauge interactions of composite fermions. The prefactor appears to be strongly enhanced as compared to the standard Altshuler-Aronov term in agreement with recent experimental observations. 1 Since 1990 a number of strong experimental evidencies of an existence of compressible metal-like states of two-dimensional (2D) electrons in a strong magnetic field at even denominator fractions was obtained [1]. Remarkably, the results of these experiments can be interpreted in terms of a simple semiclassical picture of spinless fermionic excitations forming a Fermi surface at kF = (4πne) 1/2 and experiencing only the difference magnetic field ∆B = B − 4πqne in the vicinity of ν = 1. The appropriate theoretical framework 2

Year: 1996
OAI identifier: oai:CiteSeerX.psu:10.1.1.306.2451
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