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arXiv · 1606.01710

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

François Couëdo·Hiroshi Irie·Kyoichi Suzuki·Koji Onomitsu·Koji Muraki
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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-$μ$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.

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François Couëdo, Hiroshi Irie, Kyoichi Suzuki, Koji Onomitsu, Koji Muraki. 2016-07-12. Single-edge transport in an InAs/GaSb quantum spin Hall insulator. https://doi.org/10.1103/physrevb.94.035301

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