New Journal of Physics (Jan 2016)
Edge transport in the trivial phase of InAs/GaSb
- Fabrizio Nichele,
- Henri J Suominen,
- Morten Kjaergaard,
- Charles M Marcus,
- Ebrahim Sajadi,
- Joshua A 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
Affiliations
- Fabrizio Nichele
- Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen, Denmark
- Henri J Suominen
- Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen, Denmark
- Morten Kjaergaard
- Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen, Denmark
- Charles M Marcus
- Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen, Denmark
- Ebrahim Sajadi
- Quantum Matter Institute, University of British Columbia , Vancouver, BC, V6T1Z4, Canada; Department of Physics and Astronomy, University of British Columbia , Vancouver, BC, V6T1Z1, Canada
- Joshua A Folk
- Quantum Matter Institute, University of British Columbia , Vancouver, BC, V6T1Z4, Canada; Department of Physics and Astronomy, University of British Columbia , Vancouver, BC, V6T1Z1, Canada
- Fanming Qu
- QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
- Arjan J A Beukman
- QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
- Folkert K de Vries
- QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
- Jasper van Veen
- QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
- Stevan Nadj-Perge
- QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
- Leo P Kouwenhoven
- QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
- Binh-Minh Nguyen
- HRL Laboratories , 3011 Malibu Canyon Road, Malibu, CA 90265, USA
- Andrey A Kiselev
- HRL Laboratories , 3011 Malibu Canyon Road, Malibu, CA 90265, USA
- Wei Yi
- HRL Laboratories , 3011 Malibu Canyon Road, Malibu, CA 90265, USA
- Marko Sokolich
- HRL Laboratories , 3011 Malibu Canyon Road, Malibu, CA 90265, USA
- Michael J Manfra
- Department of Physics and Astronomy and Station Q Purdue, Purdue University , West Lafayette, IN 47907, USA; School of Materials Engineering, Purdue University , West Lafayette, IN 47907, USA; School of Electrical and Computer Engineering, Purdue University , West Lafayette, IN 47907, USA; Birck Nanotechnology Center, Purdue University , West Lafayette, IN 47907, USA
- Eric M Spanton
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, CA 94025, USA; Department of Physics, Stanford University , Stanford, CA 94305, USA
- Kathryn A Moler
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, CA 94025, USA; Department of Physics, Stanford University , Stanford, CA 94305, USA; Department of Applied Physics, Stanford University , Stanford, CA 94305, USA
- DOI
- https://doi.org/10.1088/1367-2630/18/8/083005
- Journal volume & issue
-
Vol. 18,
no. 8
p. 083005
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.
Keywords
