Crystalline Sb2Te3: Side Surfaces and Disappearance of Dirac Cones

Alexander V. Kolobov, Paul Fons, Yuta Saito

Research output: Contribution to journalArticlepeer-review

Abstract

Sb2Te3 is an end point of quasibinary GeTe–Sb2Te3 phase-change alloys and also a prototypical topological insulator (TI). TIs are materials that behave like insulators in their interior but whose surfaces are characterized by metallic states with linear dispersion, the so-called Dirac cones. Such surface states are symmetry protected, robust, and are maintained even in the presence of surface defects. It has been tacitly implied that any surfaces of a TI possess this property. Herein, using ab initio simulations, it is demonstrated that cleaving Sb2Te3 along certain side surfaces may lead to the disappearance of Dirac surface states. In particular, it is shown that the (110) surface of the typical TI Sb2Te3 is slightly gapped, whereas the ((Formula presented.)) surface is metallic. The significance and potential benefits of the obtained results for practical applications in planar devices and memory cells are discussed.

Original languageEnglish
Article number2000418
JournalPhysica Status Solidi - Rapid Research Letters
Volume15
Issue number3
DOIs
Publication statusPublished - 2021 Mar

Keywords

  • Dirac cones
  • SbTe
  • phase-change memory
  • side surfaces
  • topological insulators

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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