Realization of tunable Dirac cone and insulating bulk states in topological insulators (Bi(1-x)Sb(x))(2)Te(3).

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 (Bi(1-x)Sb(x))(2)Te(3). Our results reveal that the band inversion occurs in (Bi(1-x)Sb(x))(2)Te(3), 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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Niu C,Dai Y,Zhu Y,Ma Y,Yu L,Han S,Huang B

doi

10.1038/srep00976

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

976

issn

2045-2322

journal_volume

2

pub_type

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