Non-local transport via edge-states in InAs/GaSb coupled quantum wells

Abstract

We have investigated low-temperature electronic transport on InAs/GaSb double quantum wells, a system which promises to be electrically tunable from a normal to a topological insulator. Hall bars of $50\mu$m in length down to a few $\mu$m gradually develop a pronounced resistance plateau near charge-neutrality, which comes along with distinct non-local transport along the edges. Plateau resistances are found to be above or below the quantized value expected for helical edge channels. We discuss these results based on the interplay between imperfect edges and residual local bulk conductivity.

5 pages, 3 figures

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• Nonlocal edge state transport in the quantum spin Hall state
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• Influence of etching processes on electronic transport in mesoscopic InAs/GaSb quantum well devices

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• Helical Liquids in Semiconductors
• The Anomalous de Haas-van Alphen Effect in InAs/GaSb quantum wells
• Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells
• Experimental Signatures of the Inverted Phase in InAs/GaSb Coupled Quantum Wells
• Single-edge transport in an InAs/GaSb quantum spin Hall insulator
• Robust Helical Edge Transport in Quantum Spin Hall Quantum Wells
• Progress in epitaxial thin-film Na3Bi as a topological electronic material
• Probing the semiconductor to semimetal transition in InAs/GaSb double quantum wells by magneto-infrared spectroscopy
• First principles feasibility assessment of a topological insulator at the InAs/GaSb interface
• Current noise from a magnetic moment in a helical edge
• Hidden edge Dirac point and robust quantum edge transport in InAs/GaSb quantum wells
• Giant nonlocal edge conduction in the axion insulator state of MnBi2Te4
• Helical edge transport in the presence of a magnetic impurity: the role of local anisotropy
• The effect of in-plane magnetic field and applied strain in quantum spin Hall systems: application to InAs/GaSb quantum wells
• A Topological SQUIPT based on helical edge states in proximity to superconductors
• Rashba Sandwiches with Topological Superconducting Phases
• Unrestricted electron bunching at the helical edge
• Passivation of Edge States in Etched InAs Sidewalls
• A quantum Stirling heat engine operating in finite time
• Electric control of inverted gap and hybridization gap in type II InAs/GaSb quantum wells
• Gate-tunable Electronic Transport in p-type GaSb Quantum Wells
• Circular and Linear Photogalvanic Effects in Type-II GaSb/InAs Quantum Well Structures in the Inverted Regime
• Finite frequency backscattering current noise at a helical edge
• Phase Slips and Parity Jumps in Quantum Oscillations of Inverted InAs/GaSb Quantum Wells
• Topological Charge/spin density Wave in InAs/GaSb Quantum Wells under an In-plane Magnetic Field
• Edgeless and Purely Gate-Defined Nanostructures in InAs Quantum Wells
• Analytical and Numerical study of the out-of-equilibrium current through a helical edge coupled to a magnetic impurity
• Majorana bound states in topological insulators with hidden Dirac points
• Localization of trivial edge states in InAs/GaSb composite quantum wells
• Transport in Selectively Magnetically Doped Topological Insulator Wires
• Quantum spin Hall effect in III-V semiconductors at elevated temperatures: advancing topological electronics
• Robustness of Helical Edge States Under Edge Reconstruction
• Coexistence of Topological and Normal Insulating Phases in Electro-Optically Tuned InAs/GaSb Bilayer Quantum Wells
• Voltage control of the quantum scattering time in InAs/GaSb/InAs trilayer quantum wells
• Coupled pair of one and two dimensional magneto-plasmons on electrons on helium
• Electrical tuning of helical edge states in topological multilayers
• Disorder effects in InAs/GaSb topological insulator candidates
• Anomalous flux periodicity in proximitised quantum spin Hall constrictions
• Realization of independent contacts in barrier-separated InAs/GaSb quantum wells
• Buried Dirac points in quantum spin Hall insulators: Implications for Majorana Kramers pair-based quantum computing