Semimetal behavior of bilayer stanene

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Evazzade I., Roknabadi M. R., Morshedloo T., Modarresi M., MOĞULKOÇ Y., Far H. N.

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, vol.89, pp.155-159, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 89
  • Publication Date: 2017
  • Doi Number: 10.1016/j.physe.2017.02.016
  • Journal Name: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.155-159
  • Keywords: Bilayer stanene, Semimetal behavior, Topological insulators, First-principles calculations, SPIN HALL INSULATOR, TOPOLOGICAL INSULATOR, EXPERIMENTAL REALIZATION, ELECTRONIC-STRUCTURE, GRAPHENE, 1ST-PRINCIPLES, TEMPERATURE, SILICENE, STRAIN, SHEET
  • Ankara University Affiliated: Yes

Abstract

Stanene is a two-dimensional (2D) buckled honeycomb structure which has been studied recently owing to its promising electronic properties for potential electronic and spintronic applications in nanodevices. In this article we present a first-principles study of electronic properties of fluorinated bilayer stanene. The effect of tensile strain, intrinsic spin-orbit and van der Waals interactions are considered within the framework of density functional theory. The electronic band structure shows a very small overlap between valence and conduction bands at the Gamma point which is a characteristic of semimetal in fluorinated bilayer stanene. A relatively high value of tensile strain is needed to open an energy band gap in the electronic band structure and the parity analysis reveals that the strained nanostructure is a trivial insulator. According to our results, despite the monolayer fluorinated stanene, the bilayer one is not an appropriate candidate for topological insulator.