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

Theoretical and experimental studies agree that \(\text{Bi}_{1-x}\text{Sb}_{x}\) (\(0.07 \leq x \leq 0.21\)) 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...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2015-04
Main Authors: Benia, Hadj M, Straßer, Carola, Kern, Klaus, Ast, Christian R
Format: Article
Language:English
Subjects:
Antimony
Band structure
Band structure of solids
Band theory
Banded structure
Bismuth
Defects
Photoelectric emission
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Theoretical and experimental studies agree that \(\text{Bi}_{1-x}\text{Sb}_{x}\) (\(0.07 \leq x \leq 0.21\)) 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1412.4596