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Decoupling Edge Versus Bulk Conductance in the Trivial Regime of an InAs/GaSb Double Quantum Well Using Corbino Ring Geometry

Nguyen, Binh-Minh and Kiselev, Andrey A. and Noah, Ramsey and Yi, Wei and Qu, Fanming and Beukman, Arjan J. A. and de Vries, Folkert K. and van Veen, Jasper and Nadj-Perge, Stevan and Kouwenhoven, Leo P. and Kjaergaard, Morten and Suominen, Henri J. and Nichele, Fabrizio and Marcus, Charles M. and Manfra, Michael J. and Sokolich, Marko (2016) Decoupling Edge Versus Bulk Conductance in the Trivial Regime of an InAs/GaSb Double Quantum Well Using Corbino Ring Geometry. Physical Review Letters, 117 (7). Art. No. 077701. ISSN 0031-9007. doi:10.1103/PhysRevLett.117.077701.

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A Corbino ring geometry is utilized to analyze edge and bulk conductance of InAs/GaSb quantum well structures. We show that edge conductance exists in the trivial regime of this theoretically predicted topological system with a temperature-insensitive linear resistivity per unit length in the range of 2  kΩ/μm. A resistor network model of the device is developed to decouple the edge conductance from the bulk conductance, providing a quantitative technique to further investigate the nature of this trivial edge conductance, conclusively identified here as being of n type.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Nadj-Perge, Stevan0000-0002-2916-360X
Marcus, Charles M.0000-0003-2420-4692
Additional Information:© 2016 American Physical Society. Received 2 May 2016; published 12 August 2016. This work was partially supported by Microsoft Station Q, the Netherlands Foundation for Fundamental Research on Matter (FOM), the Danish National Research Foundation, and the European Commission through the Marie Curie Fellowship Program.
Funding AgencyGrant Number
Microsoft Station QUNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Danish National Research FoundationUNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20170505-112142473
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77224
Deposited By: Tony Diaz
Deposited On:05 May 2017 19:20
Last Modified:15 Nov 2021 17:29

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