Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.186603
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Funding
- Hackerman Advanced Research Program [003604-0062-2009]
- Welch Foundation [C-1682]
- NSF [DMR-0706634, DMR-1207562]
- Welch Predoctoral Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1207562] Funding Source: National Science Foundation
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We present an experimental study of S-N-S junctions, with N being a quantum spin Hall insulator made of InAs/GaSb. A front gate is used to vary the Fermi level into the minigap, where helical edge modes exist [Phys. Rev. Lett. 107, 136603 (2011)]. In this regime we observe a similar to 2e(2)/h Andreev conductance peak, consistent with a perfect Andreev reflection on the helical edge modes predicted by theories. The peak diminishes under a small applied magnetic field due to the breaking of time-reversal symmetry. This work thus demonstrates the helical property of the edge modes in a quantum spin Hall insulator.
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