Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-08-25
Phys. Rev. B 81, 041307 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 3 figures; 3 added references, an added note
Scientific paper
We investigate the crossover regime from three dimensional topological insulators $Bi_2Te_3$ and $Bi_2Se_3$ to two dimensional topological insulators with quantum spin Hall effect when the layer thickness is reduced. Using both analytical models and first-principles calculations, we find that the crossover occurs in an oscillatory fashion as a function of the layer thickness, alternating between topologically trivial and non-trivial two dimensional behavior.
Dai Xian-Xin
Fang Zhong
Frauenheim Thomas
Liu Chao-Xing
Qi Xiao-Liang
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