Non-linear magnetotransport phenomena in high-mobility two-dimensional electrons in InGaAs/InP and GaAs/AlGaAs

Details Non-linear magnetotransport phenomena in high-mobility two-dimensional electrons in InGaAs/InP and GaAs/AlGaAs Non-linear magnetotransport phenomena in high-mobility two-dimensional electrons in InGaAs/InP and GaAs/AlGaAs

2010-11-30

arxiv.org/abs/1012.0043v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

This is an extended version of the paper. Low-field experimental data on the SdH phase inversion phenomenon and corresponding

Scientific paper

This paper reports the observation and analysis of novel magnetotransport phenomena in the nonlinear differential resistance rxx = dVxx/dI of high-mobility InxGa1-xAs/InP and GaAs/AlxGa1-xAs Hall bar samples driven by direct current (DC). Specifically, it was observed that Shubnikov -de Haas (SdH) oscillations at large filling factors invert their phase at sufficiently large densities of DC currents. This phase inversion can be explained by an electron heating effect using standard equations for SdH oscillations at large filling factors. In the quantum Hall regime the oscillation pattern, if presented in a grey scale format vs. magnetic field and direct current, transforms into diamond-shape features with different slopes for odd and even filling factors. At odd filling factors the observed diamonds can be used as an alternative probe to determine spin energy gaps. We also report on the observation of a Zero Current Anomaly (ZCA) which manifests itself as a narrow dip of an approximately {\simeq}100{\mu}eV width in the rxx(I_DC) characteristics at zero DC. The ZCA strongly depends on temperature and vanishes above 1 K while the transport diamonds persist to higher temperatures.

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