Band structure engineering in (Bi1-xSbx) 2Te3 ternary topological insulators

Jinsong Zhang, Cui Zu Chang, Zuocheng Zhang, Jing Wen, Xiao Feng, Kang Li, Minhao Liu, Ke He, Lili Wang, Xi Chen, Qi Kun Xue, Xucun Ma, Yayu Wang

Research output: Contribution to journalArticlepeer-review

348 Scopus citations

Abstract

Topological insulators (TIs) are quantum materials with insulating bulk and topologically protected metallic surfaces with Dirac-like band structure. The most challenging problem faced by current investigations of these materials is to establish the existence of significant bulk conduction. Here we show how the band structure of topological insulators can be engineered by molecular beam epitaxy growth of (Bi1-xSbx)2Te3 ternary compounds. The topological surface states are shown to exist over the entire composition range of (Bi1-xSbx)2Te 3, indicating the robustness of bulk Z2 topology. Most remarkably, the band engineering leads to ideal TIs with truly insulating bulk and tunable surface states across the Dirac point that behaves like one-quarter of graphene. This work demonstrates a new route to achieving intrinsic quantum transport of the topological surface states and designing conceptually new topologically insulating devices based on well-established semiconductor technology.

Original languageEnglish (US)
Article number574
JournalNature communications
Volume2
Issue number1
DOIs
StatePublished - 2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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