期刊
FRONTIERS OF PHYSICS
卷 7, 期 2, 页码 200-207出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s11467-011-0204-1
关键词
quantum spin Hall effect; InAs/GaSb quantum wells; topological insulators
资金
- Rice Faculty Initiative
- Hackerman Advanced Research Program [003604-0062-2009]
- Welch Foundation [C-1682]
- NSF [DMR-0706634]
We review the recent experimental progress towards observing quantum spin Hall effect in inverted InAs/GaSb quantum wells (QWs). Low temperature transport measurements in the hybridization gap show bulk conductivity of a non-trivial origin, while the length and width dependence of conductance in this regime show strong evidence for the existence of helical edge modes proposed by Liu et al. [Phys. Rev. Lett., 2008, 100: 236601]. Surprisingly, edge modes persist in spite of comparable bulk conduction and show only weak dependence on magnetic field. We elucidate that seeming independence of edge on bulk transport comes due to the disparity in Fermi-wave vectors between the bulk and the edge, leading to a total internal reflection of the edge modes.
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