Band gap engineering of silicene zigzag nanoribbons with perpendicular electric fields: A theoretical study

Yunye Liang, Vei Wang, Hiroshi Mizuseki, Yoshiyuki Kawazoe

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

The electronic properties of silicene zigzag nanoribbons with the presence of perpendicular fields are studied by using first-principles calculations and the generalized nearest neighboring approximation method. In contrast to the planar graphene, in silicene the Si atoms are not coplanar. As a result, by applying perpendicular fields to the two-dimensional silicene sheet, the on-site energy can be modulated and the band gap at the Dirac point is open. The buckled structure also creates a height difference between the two edges of the silicene zigzag nanoribbons. We find that the external fields can modulate the energies of spin-polarized edge states and their corresponding band gaps. Due to the polarization in the plane, the modulation effect is width dependent and becomes much more significant for narrow ribbons.

Original languageEnglish
Article number455302
JournalJournal of Physics Condensed Matter
Volume24
Issue number45
DOIs
Publication statusPublished - 2012 Nov 14

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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