Surface band structure of ${\text{Bi}}_{1-x}{\text{Sb}}_x$(111)

Abstract

Theoretical and experimental studies agree that ${\text{Bi}}_{1-x}{\text{Sb}}_x$ ($0.07\le x\le 0.21$) to be a three-dimensional topological insulator. However, there is still a debate on the corresponding ${\text{Bi}}_{1-x}{\text{Sb}}_x$(111) surface band structure. While three spin polarized bands have been claimed experimentally, theoretically, only two surface bands appear, with the third band being attributed to surface imperfections. Here, we address this controversy using angle-resolved photoemission spectroscopy (ARPES) on ${\text{Bi}}_{1-x}{\text{Sb}}_x$ films. To minimize surface imperfections, we have optimized the sample growth recipe. We have measured the evolution of the surface band structure of ${\text{Bi}}_{1-x}{\text{Sb}}_x$ with $x$ increasing gradually from $x=0$ to $x=0.6$. Our ARPES data show better agreement with the theoretical calculations, where the system is topologically non-trivial with two surface bands.

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• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• Surface States of the Topological Insulator Bi_{1-x}Sb_x
• Strong spin-orbit splitting on Bi surfaces
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