Electronic structures and surface states of the topological insulator Bi1-x Sbx

Hai Jun Zhang, Chao Xing Liu, Xiao Liang Qi, Xiao Yu Deng, Xi Dai, Shou Cheng Zhang, Zhong Fang

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101 Scopus citations

Abstract

We investigate the electronic structures of the alloyed Bi1-x Sbx compounds based on first-principles calculations including spin-orbit coupling (SOC), and calculate the surface states of semi-infinite systems using maximally localized Wannier function. From the calculated results, we analyze the topological nature of Bi1-x Sbx, and found the followings: (1) pure Bi crystal is topologically trivial. (2) Topologically nontrivial phase can be realized by reducing the strength of SOC via Sb doping. (3) The indirect bulk band gap, which is crucial to realize the true bulk insulating phase, can be enhanced by uniaxial pressure along c axis. (4) The calculated surface states can be compared with experimental results, which confirms the topological nature. (5) We predict the spin-resolved Fermi surfaces and showed the vortex structures, which should be examined by future experiments.

Original languageEnglish (US)
Article number085307
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number8
DOIs
StatePublished - Aug 13 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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