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

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.86.115309
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TypeArticle
Journal titlePhysical Review B - Condensed Matter and Materials Physics
ISSN1098-0121
Volume86
Issue11
Article number115309
AbstractThis paper reports on the observation and analysis of magnetotransport phenomena in the nonlinear differential resistance rxx=dVxx/dI of high-mobility In xGa 1-xAs/InP and GaAs/Al xGa 1-xAs Hall bar samples driven by direct current I dc. Specifically, it is observed that Shubnikov-de Haas (SdH) oscillations at large filling factors invert their phase at sufficiently large values of Idc. This phase inversion is explained as being due to an electron heating effect. In the quantum Hall effect regime the rxx oscillations transform into diamond-shaped patterns with different slopes corresponding to odd and even filling factors. The diamond-shaped features at odd filling factors can be used as a probe to determine spin energy gaps. A zero current anomaly (ZCA) which manifests itself as a narrow dip in the rxx(Idc) characteristics at zero current is also observed. The ZCA effect strongly depends upon temperature, vanishing above 1 K while the transport diamonds persist to higher temperatures. The transport diamonds and ZCA are fully reproduced in a higher mobility GaAs/AlGaAs Hall bar structure confirming that these phenomena reflect intrinsic properties of two-dimensional systems.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; Security and Disruptive Technologies; Measurement Science and Standards; Information and Communication Technologies
Peer reviewedYes
NPARC number21270157
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Record identifier503fb0e7-8d63-49fe-b58a-108eb96921ed
Record created2014-01-06
Record modified2016-05-09
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