Edge transport in the trivial phase of InAs/GaSb

Fabrizio Nichele; Henri Juhani Suominen; Morten Kjærgaard; Charles M. Marcus; Ebrahim Sajadi; Joshua Folk; Fanming Qu; Arjan J. A. Beukman; Folkert K de Vries; Jasper van Veen; Stevan Nadj-Perge; Leo P. Kouwenhoven; Binh-Minh Nguyen; Andrey A. Kiselev; Wei Yi; Marko Sokolich; Michael J. Manfra; Eric M. Spanton; Kathryn A. Moler

doi:10.1088/1367-2630/18/8/083005

Edge transport in the trivial phase of InAs/GaSb

Fabrizio Nichele, Henri Juhani Suominen, Morten Kjærgaard, Charles M. Marcus, Ebrahim Sajadi, Joshua Folk, Fanming Qu, Arjan J. A. Beukman, Folkert K de Vries, Jasper van Veen, Stevan Nadj-Perge, Leo P. Kouwenhoven, Binh-Minh Nguyen, Andrey A. Kiselev, Wei Yi, Marko Sokolich, Michael J. Manfra, Eric M. Spanton, Kathryn A. Moler

Condensed Matter Physics

71 Citations (Scopus)

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Abstract

We present 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. We characterize 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.

Original language	English
Article number	083005
Journal	New Journal of Physics
Volume	18
ISSN	1367-2630
DOIs	https://doi.org/10.1088/1367-2630/18/8/083005
Publication status	Published - Aug 2016

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Nichele, F., Suominen, H. J., Kjærgaard, M., Marcus, C. M., Sajadi, E., Folk, J., Qu, F., Beukman, A. J. A., de Vries, F. K., van Veen, J., Nadj-Perge, S., Kouwenhoven, L. P., Nguyen, B.-M., Kiselev, A. A., Yi, W., Sokolich, M., Manfra, M. J., Spanton, E. M., & Moler, K. A. (2016). Edge transport in the trivial phase of InAs/GaSb. New Journal of Physics, 18, Article 083005. https://doi.org/10.1088/1367-2630/18/8/083005

Nichele, F, Suominen, HJ, Kjærgaard, M , Marcus, CM, Sajadi, E, Folk, J, Qu, F, Beukman, AJA, de Vries, FK, van Veen, J, Nadj-Perge, S, Kouwenhoven, LP, Nguyen, B-M, Kiselev, AA, Yi, W, Sokolich, M, Manfra, MJ, Spanton, EM & Moler, KA 2016, 'Edge transport in the trivial phase of InAs/GaSb', New Journal of Physics, vol. 18, 083005. https://doi.org/10.1088/1367-2630/18/8/083005

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title = "Edge transport in the trivial phase of InAs/GaSb",

abstract = "We present 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. We characterize 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.",

author = "Fabrizio Nichele and Suominen, {Henri Juhani} and Morten Kj{\ae}rgaard and Marcus, {Charles M.} and Ebrahim Sajadi and Joshua Folk and Fanming Qu and Beukman, {Arjan J. A.} and {de Vries}, {Folkert K} and {van Veen}, Jasper and Stevan Nadj-Perge and Kouwenhoven, {Leo P.} and Binh-Minh Nguyen and Kiselev, {Andrey A.} and Wei Yi and Marko Sokolich and Manfra, {Michael J.} and Spanton, {Eric M.} and Moler, {Kathryn A.}",

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T1 - Edge transport in the trivial phase of InAs/GaSb

AU - Nichele, Fabrizio

AU - Suominen, Henri Juhani

AU - Kjærgaard, Morten

AU - Marcus, Charles M.

AU - Sajadi, Ebrahim

AU - Folk, Joshua

AU - Qu, Fanming

AU - Beukman, Arjan J. A.

AU - de Vries, Folkert K

AU - van Veen, Jasper

AU - Nadj-Perge, Stevan

AU - Kouwenhoven, Leo P.

AU - Nguyen, Binh-Minh

AU - Kiselev, Andrey A.

AU - Yi, Wei

AU - Sokolich, Marko

AU - Manfra, Michael J.

AU - Spanton, Eric M.

AU - Moler, Kathryn A.

N1 - [Qdev]

PY - 2016/8

Y1 - 2016/8

N2 - We present 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. We characterize 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.

AB - We present 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. We characterize 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.

U2 - 10.1088/1367-2630/18/8/083005

DO - 10.1088/1367-2630/18/8/083005

M3 - Journal article

SN - 1367-2630

VL - 18

JO - New Journal of Physics

JF - New Journal of Physics

M1 - 083005

ER -

Edge transport in the trivial phase of InAs/GaSb

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