Affordable Access

Publisher Website

Realization of tunable Dirac cone and insulating bulk states in topological insulators (Bi1−xSbx)2Te3

Authors
Journal
Scientific Reports
2045-2322
Publisher
Nature Publishing Group
Publication Date
Volume
2
Identifiers
DOI: 10.1038/srep00976
Keywords
  • Article
Disciplines
  • Design
  • Mathematics
  • Physics

Abstract

The bulk-insulating topological insulators with tunable surface states are necessary for applications in spintronics and quantum computation. Here we present theoretical evidence for modulating the topological surface states and achieving the insulating bulk states in solid-solution (Bi1−xSbx)2Te3. Our results reveal that the band inversion occurs in (Bi1−xSbx)2Te3, indicating the non-triviality across the entire composition range, and the Dirac point moves upwards till it lies within the bulk energy gap accompanying the increase of Sb concentration x. In addition, with increasing x, the formation of prominent native defects becomes much more difficult, resulting in the truly insulating bulk. The solid-solution system is a promising way of tuning the properties of topological insulators and designing novel topologically insulating devices.

There are no comments yet on this publication. Be the first to share your thoughts.