Evolution of surface states in Bi1-xSbx alloys across the topological phase transition

H. Guo, K. Sugawara, A. Takayama, S. Souma, T. Sato, N. Satoh, A. Ohnishi, M. Kitaura, M. Sasaki, Q. K. Xue, T. Takahashi

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


We performed a systematic, high-resolution, angle-resolved photoemission spectroscopy of Bi1-xSbx alloys to study the evolution of electronic states as a function of Sb concentration x. We revealed that the number of Fermi-level crossings is different between the topologically trivial (x= 0.023) and nontrivial (x= 0.17) phases: four and five times for the former and latter cases, respectively. We also found a systematic expansion of the bandwidth of spin-split surface bands at the Γ point upon substituting Bi with Sb, which is indicative of the monotonous reduction of the spin-orbit coupling strength.

Original languageEnglish
Article number201104
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number20
Publication statusPublished - 2011 May 31

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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