Single-edge transport in an InAs/GaSb quantum spin Hall insulator

Abstract

We report transport measurements in a single edge channel of an InAs/GaSb quantum spin Hall insulator, where the conduction occurs through only one pair of counterpropagating edge modes. By using a specific sample design involving highly asymmetric current paths, we electrically isolate a single edge channel of the two-dimensional topological insulator from the other edge. This enables us to probe a single edge by multiterminal measurements. Both two-terminal and four-terminal resistances show a nearly quantized plateau around $h/e^2$ for a 4-$\mu$m-long edge, indicating quasiballistic transport. Our approach is advantageous in that it allows us to gain insight into a microscopic region from local measurements.

arXiv comment5 pages, 5 figures

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Cited by in corpus (19)

• Tuning Edge States in Strained-Layer InAs/GaInSb Quantum Spin Hall Insulators
• Effects of nuclear spins on the transport properties of the edge of two-dimensional topological insulators
• The Anomalous de Haas-van Alphen Effect in InAs/GaSb quantum wells
• Helical Liquids in Semiconductors
• Robust Helical Edge Transport in Quantum Spin Hall Quantum Wells
• Gapless insulating edges of dirty interacting topological insulators
• Engineering quantum spin Hall insulators by strained-layer heterostructures
• Low-Temperature Conductivity of Weakly Interacting Quantum Spin Hall Edges in Strained-Layer InAs/GaInSb
• Current noise from a magnetic moment in a helical edge
• Rashba Sandwiches with Topological Superconducting Phases
• Localization-Driven Correlated States of Two Isolated Interacting Helical Edges
• Time-resolved measurement of ambipolar edge magnetoplasmon transport in InAs/InGaSb composite quantum wells
• Localization of trivial edge states in InAs/GaSb composite quantum wells
• Impact of epitaxial strain on the topological-nontopological phase diagram and semimetallic behavior of InAs/GaSb composite quantum wells
• Multi-probe analysis to separate edge currents from bulk currents in quantum spin Hall insulators and to analyze their temperature dependence
• Fermi level tuning and band alignment in Mn doped InAs/GaSb
• Finite-temperature spectroscopy of dirty helical Luttinger liquids
• Realization of independent contacts in barrier-separated InAs/GaSb quantum wells
• On the accuracy of conductance quantization in spin-Hall insulators