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arXiv · 1708.09835

Bloch-Grüneisen nonlinearity of electron transport in GaAs/AlGaAs heterostructures

O. E. Raichev·A. T. Hatke·M. A. Zudov·J. L. Reno
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Abstract

We report on nonlinear transport measurements in a two-dimensional electron gas hosted in GaAs/AlGaAs heterostructures. Upon application of direct current, the low-temperature differential resistivity acquires a positive correction, which exhibits a pronounced maximum followed by a plateau. With increasing temperature, the nonlinearity diminishes and disappears. These observations can be understood in terms of a crossover from the Bloch-Grüneisen regime to the quasielastic scattering regime as the electrons are heated by direct current. Calculations considering the interaction of electrons with acoustic phonons provide a reasonable description of our experimental findings.

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O. E. Raichev, A. T. Hatke, M. A. Zudov, J. L. Reno. 2017-08-31. Bloch-Grüneisen nonlinearity of electron transport in GaAs/AlGaAs heterostructures. https://doi.org/10.1103/physrevb.96.081407

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