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Images of edge current in InAs/GaSb quantum wells

Quantum spin Hall devices with edges much longer than several microns do not display ballistic transport: that is, their measured conductances are much less than $e^2/h$ per edge. We imaged edge currents in InAs/GaSb quantum wells with long edges and determined an effective edge resistance. Surprisingly, although the effective edge resistance is much greater than $h/e^2$, it is independent of temperature up to 30 K within experimental resolution. Known candidate scattering mechanisms do not explain our observation of an effective edge resistance that is large yet temperature-independent.

preprint2014arXivOpen access
Eric M. SpantonKatja C. NowackLingjie DuGerard SullivanRui-Rui DuKathryn A. Moler
cond-mat.mes-hall
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Open access6 authors1 topic
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Eric M. SpantonKatja C. NowackLingjie DuGerard SullivanRui-Rui DuKathryn A. Moler

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