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Abstract: We consider transport of dilute two-dimensional electrons, with temperaturebetween Fermi and Debye temperatures. In this regime, electrons form anondegenerate plasma with mobility limited by potential disorder. Differentkinds of impurities contribute unique signatures to the resultingtemperature-dependent Drude conductivity, via energy-dependent scattering. Thisopens up a way to characterize sample disorder composition. In particular,neutral impurities cause a slow decrease in conductivity with temperature,whereas charged impurities result in conductivity growing as a square root oftemperature. This observation serves as a precaution for literally interpretingmetallic or insulating conductivity dependence, as both can be found in aclassical metallic system.



Autor: D. S. Novikov

Fuente: https://arxiv.org/







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