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- Title
ROBUST TRANSPORT OF QUANTUM SPIN HALL STATE IN HgTe/CdTe QUANTUM WELL.
- Authors
WANG, YI-XIANG; XIONG, SHI-JIE
- Abstract
Quantum Spin Hall (QSH) state in HgTe/CdTe quantum well is a novel physical state which has been predicted in theory and confirmed experimentally. We numerically investigate the effect of nonmagnetic scattering potential at the edge of the quantum well on transport properties of the system. Various shapes of the potential, such as the bar or the semicircular shape, are investigated. The results obtained with the help of the Green's function technique suggest that the transport of the QSH state is indeed a robust one where the conductivity takes a constant value $\frac{2e^2}{h}$ independent of the number, shape, strength or length of the scattering potential. Meanwhile the transport of electrons in the bulk states is significantly influenced by the above physical ingredients. From these results a simple approach to verify the existence of the transport of the QSH states at the edge is proposed.
- Subjects
GREEN'S functions; ELECTRIC conductivity; ELECTRONS; QUANTUM wells; POTENTIAL theory (Physics); DIFFERENTIAL equations
- Publication
Modern Physics Letters B, 2011, Vol 25, Issue 25, p2001
- ISSN
0217-9849
- Publication type
Article
- DOI
10.1142/S021798491102711X