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Qu, F. (author), Beukman, A.J.A. (author), Nadj-Perge, S. (author), Wimmer, M.T. (author), Nguyen, B.M. (author), Yi, W. (author), Thorp, J. (author), Sokolich, M. (author), Kiselev, A.A. (author), Manfra, M.J. (author), Marcus, C.M. (author), Kouwenhoven, L.P. (author)
Among the theoretically predicted two-dimensional topological insulators, InAs/GaSb double quantum wells (DQWs) have a unique double-layered structure with electron and hole gases separated in two layers, which enables tuning of the band alignment via electric and magnetic fields. However, the rich trivial-topological phase diagram has yet to be...
journal article 2015
document
Nichele, Fabrizio (author), Suominen, Henri J. (author), Kjaergaard, Morten (author), Marcus, Charles M. (author), Sajadi, Ebrahim (author), Folk, Joshua A. (author), Qu, F. (author), Beukman, A.J.A. (author), de Vries, F.K. (author), van Veen, J. (author), Nadj-Perge, S. (author), Kouwenhoven, L.P. (author)
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...
journal article 2016
document
Nguyen, Binh Minh (author), Kiselev, Andrey A. (author), Noah, Ramsey (author), Yi, Wei (author), Qu, F. (author), Beukman, A.J.A. (author), de Vries, F.K. (author), van Veen, J. (author), Nadj-Perge, S. (author), Kouwenhoven, L.P. (author), Kjaergaard, Morten (author), Suominen, Henri J. (author), Nichele, Fabrizio (author), Marcus, Charles M. (author), Manfra, Michael J. (author), Sokolich, Marko (author)
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...
journal article 2016
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Beukman, A.J.A. (author), de Vries, F.K. (author), van Veen, J. (author), Skolasinski, R.J. (author), Wimmer, M.T. (author), Qu, F. (author), De Vries, David T. (author), Nguyen, Binh Minh (author), Kouwenhoven, L.P. (author)
The spin-orbit interaction is investigated in a dual gated InAs/GaSb quantum well. Using an electric field, the quantum well can be tuned between a single-carrier regime with exclusively electrons as carriers and a two-carrier regime where electrons and holes coexist. The spin-orbit interaction in both regimes manifests itself as a beating in...
journal article 2017
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Nichele, Fabrizio (author), Kjaergaard, Morten (author), Suominen, Henri J. (author), Skolasinski, R.J. (author), Wimmer, M (author), Nguyen, Binh Minh (author), Qu, F. (author), Beukman, A.J.A. (author), Kouwenhoven, L.P. (author)
Transport measurements in inverted InAs/GaSb quantum wells reveal a giant spin-orbit splitting of the energy bands close to the hybridization gap. The splitting results from the interplay of electron-hole mixing and spin-orbit coupling, and can exceed the hybridization gap. We experimentally investigate the band splitting as a function of top...
journal article 2017
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de Vries, F.K. (author), Timmerman, Tom (author), Ostroukh, Viacheslav P. (author), van Veen, J. (author), Beukman, A.J.A. (author), Qu, F. (author), Wimmer, M.T. (author), Kiselev, Andrey A. (author), Kouwenhoven, Leo P. (author), More Authors (author)
Josephson junctions defined in strong spin orbit semiconductors are highly interesting for the search for topological systems. However, next to topological edge states that emerge in a sufficient magnetic field, trivial edge states can also occur. We study the trivial edge states with superconducting quantum interference measurements on...
journal article 2018
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