Temperature-dependent Drude transport in a two-dimensional electron gas

Abstract

We consider transport of dilute two-dimensional electrons, with temperature between Fermi and Debye temperatures. In this regime, electrons form a nondegenerate plasma with mobility limited by potential disorder. Different kinds of impurities contribute unique signatures to the resulting temperature-dependent Drude conductivity, via energy-dependent scattering. This opens 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 of temperature. This observation serves as a precaution for literally interpreting metallic or insulating conductivity dependence, as both can be found in a classical metallic system.

5 pages, 2 figures, published version

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Cited by in corpus (4)

• Strongly correlated two-dimensional plasma explored from entropy measurements
• Quantization of entropy in a quasi-two-dimensional electron gas
• Entropy Signatures of Topological Phase Transitions
• Degenerate versus semi-degenerate transport in a correlated 2D hole system