Journal
NEW JOURNAL OF PHYSICS
Volume 18, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/18/8/083005
Keywords
quantum spin Hall effect; topological insulator; scanning SQUID; InAs/GaSb
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Funding
- Microsoft Corporation Station Q
- Danish National Research Foundation
- Villum Foundation
- Netherlands Foundation for Fundamental Research on Matter (FOM)
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- European Community [659653]
- QMI
- NSERC
- CFI
- Marie Curie Actions (MSCA) [659653] Funding Source: Marie Curie Actions (MSCA)
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Wepresent transport and scanning SQUID measurements on InAs/GaSb double quantum wells, a system predicted to be a two-dimensional topological insulator. Top and back gates allow independent control of density and band offset, allowing tuning from the trivial to the topological regime. In the trivial regime, bulk conductivity is quenched but transport persists along the edges, superficially resembling the predicted helical edge-channels in the topological regime. Wecharacterize edge conduction in the trivial regime in a wide variety of sample geometries and measurement configurations, as a function of temperature, magnetic field, and edge length. Despite similarities to studies claiming measurements of helical edge channels, our characterization points to a non-topological origin for these observations.
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