期刊
PHYSICAL REVIEW B
卷 98, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.201404
关键词
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资金
- Dutch national science organization NWO
- Microsoft Corporation Station
- National Science Foundation [DMR-1723367]
- Army Research Office [W911NF-17-1-0323]
- Caltech Institute for Quantum Information and Matter, an NSF Physics Frontiers Center
- Gordon and Betty Moore Foundation [GBMF1250]
- Walter Burke Institute for Theoretical Physics at Caltech
We show that edge-state transport in semiconductor-based quantum spin Hall systems is unexpectedly robust to magnetic fields. The origin for this robustness lies in an intrinsic suppression of the edge-state g-factor and the fact that the edge-state Dirac point is typically hidden in the valence band. A detailed k.p band-structure analysis reveals that both InAs/GaSb and HgTe/CdTe quantum wells exhibit such buried Dirac points for a wide range of well thicknesses. By simulating transport in a disordered system described within an effective model, we demonstrate that edge-state transport remains nearly quantized up to large magnetic fields, consistent with recent experiments.
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