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Well-localized edge states in two-dimensional topological insulators: ultrathin Bi films

We theoretically study the generic behavior of the penetration depth of the edge states in two-dimensional quantum spin Hall systems. We found that the momentum-space width of the edge-state dispersion scales with the inverse of the penetration depth. As an example of well-localized edge states, we take the Bi(111) ultrathin film. Its edge states are found to extend almost over the whole Brillouin zone. Correspondingly, the bismuth (111) 1-bilayer system is proposed to have well-localized edge states in contrast to the HgTe quantum well.

preprint2010arXivOpen access
M. WadaS. MurakamiF. FreimuthG. Bihlmayer
cond-mat.mes-hallcond-mat.mtrl-sci
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M. WadaS. MurakamiF. FreimuthG. Bihlmayer

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