This title appears in the Scientific Report : 2011 

Localized edge states in two-dimensional topological insulators: Ultrathin Bi films
Wada, M.
Murakami, S. / Freimuth, F. / Bihlmayer, G.
Quanten-Theorie der Materialien; PGI-1
Quanten-Theorie der Materialien; IAS-1
Physical review / B, 83 (2011) S. 121310
College Park, Md. APS 2011
Journal Article
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Physical Review B 83
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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.