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Calibri 83ffff̙̙3f3fff3f3f33333f33333.:TU Delft Repositoryg t1uuidrepository linktitleauthorcontributorpublication yearabstract
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departmentresearch group programmeprojectcoordinates)uuid:bee065eb7b86443d93e0e19f2800fa3eDhttp://resolver.tudelft.nl/uuid:bee065eb7b86443d93e0e19f2800fa3e0Edge transport in the trivial phase of InAs/GaSbNichele, Fabrizio (University of Copenhagen); Suominen, Henri J. (University of Copenhagen); Kjaergaard, Morten (University of Copenhagen); Marcus, Charles M. (University of Copenhagen); Sajadi, Ebrahim (University of British Columbia); Folk, Joshua A. (University of British Columbia); Qu, F. (TU Delft Kouwenhoven Lab); Beukman, A.J.A. (TU Delft Kouwenhoven Lab); de Vries, F.K. (TU Delft Kouwenhoven Lab); van Veen, J. (TU Delft Kouwenhoven Lab); NadjPerge, S. (TU Delft QN/Quantum Transport); Kouwenhoven, L.P. (TU Delft Kouwenhoven Lab)/We present transport and scanning SQUID measurements on InAs/GaSb double quantum wells, a system predicted to be a twodimensional 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 edgechannels 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 nontopological origin for these observations.JINAS/GASB; Quantum spin Hall effect; Scanning SQUID; Topological insulatorenjournal articleKouwenhoven Lab)uuid:4cdcba6ea5a342aeb0c5ef19bd0f35e5Dhttp://resolver.tudelft.nl/uuid:4cdcba6ea5a342aeb0c5ef19bd0f35e5}Decoupling Edge Versus Bulk Conductance in the Trivial Regime of an InAs/GaSb Double Quantum Well Using Corbino Ring GeometryNguyen, Binh Minh (HRL Laboratories); Kiselev, Andrey A. (HRL Laboratories); Noah, Ramsey (HRL Laboratories); Yi, Wei (HRL Laboratories); Qu, F. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Beukman, A.J.A. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); de Vries, F.K. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); van Veen, J. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); NadjPerge, S. (TU Delft QN/Quantum Transport; TU Delft QuTech; Kavli institute of nanoscience Delft); Kouwenhoven, L.P. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Kjaergaard, Morten (University of Copenhagen); Suominen, Henri J. (University of Copenhagen); Nichele, Fabrizio (University of Copenhagen); Marcus, Charles M. (University of Copenhagen); Manfra, Michael J. (Purdue University); Sokolich, Marko (HRL Laboratories)?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 temperatureinsensitive linear resistivity per unit length in the range of 2 k/m. 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.QuTech)uuid:7717b72a75cf4692829b5ad7598f8e42Dhttp://resolver.tudelft.nl/uuid:7717b72a75cf4692829b5ad7598f8e42=Spinorbit interaction in a dual gated InAs/GaSb quantum well3Beukman, A.J.A. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); de Vries, F.K. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); van Veen, J<. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Skolasinski, R.J. (TU Delft TQC/Wimmer Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Wimmer, M.T. (TU Delft TQC/Wimmer Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Qu, F. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); De Vries, David T. (Student TU Delft; Kavli institute of nanoscience Delft); Nguyen, Binh Minh (HRL Laboratories); Kouwenhoven, L.P. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Microsoft Station Q Delft; Kavli institute of nanoscience Delft)The spinorbit interaction is investigated in a dual gated InAs/GaSb quantum well. Using an electric field, the quantum well can be tuned between a singlecarrier regime with exclusively electrons as carriers and a twocarrier regime where electrons and holes coexist. The spinorbit interaction in both regimes manifests itself as a beating in the Shubnikovde Haas oscillations. In the singlecarrier regime the linear Dresselhaus strength is characterized by =28.5 meV and the Rashba coefficient is tuned from 75 to 53 meV by changing the electric field. In the twocarrier regime a quenching of the spin splitting is observed and attributed to a crossing of spin bands.)uuid:c9be5754479e49eb8d6fe2d186291316Dhttp://resolver.tudelft.nl/uuid:c9be5754479e49eb8d6fe2d186291316MH /e Superconducting Quantum Interference through Trivial Edge States in InAsde Vries, F.K. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Timmerman, Tom (Student TU Delft; Kavli institute of nanoscience Delft); Ostroukh, Viacheslav P. (Leiden University); van Veen, J. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Beukman, A.J.A. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Qu, F. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Wimmer, M.T. (TU Delft TQC/Wimmer Lab; TU Delft QuTech; Kavli institute of nanoscience Delft); Kiselev, Andrey A. (HRL Laboratories); Kouwenhoven, Leo P. (TU Delft Kouwenhoven Lab; TU Delft QuTech; Microsoft Station Q Delft; Kavli institute of nanoscience Delft); More Authors (Extern)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 nontopological InAs Josephson junctions. We observe a SQUID pattern, an indication of superconducting edge transport. Also, a remarkable h/e SQUID signal is observed that, as we find, stems from crossed Andreev states.
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