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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

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
Volume83
Issue number20
DOIs
Publication statusPublished - 2011 May 31
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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