Band Gap on/off Switching of Silicene Superlattice

Tian Tian Jia, Meng Meng Zheng, Xin Yu Fan, Yan Su, Shu Juan Li, Hai Ying Liu, Gang Chen, Yoshiyuki Kawazoe

研究成果: Article査読

19 被引用数 (Scopus)

抄録

On the basis of density functional theory calculations with generalized gradient approximation, we have investigated in detail the cooperative effects of uniaxial strain and degenerate perturbation on manipulating the band gap in silicene. The uniaxial strain would split π bands into πa and πz bands, resulting in Dirac cone movement. Then, the hexagonal antidot would split πaz) bands into πa1 and πa2z1 and πz2) bands, accounting for the band gap opening in the superlattices with the Dirac cone being folded to the Γ point, which is a different mechanism as compared to the sublattice equivalence breaking. The energy interval between the split πa and πz bands could be tuned to switch band gap on and off, suggesting a reversible switch between the high charge carrier velocity properties of massless Fermions attributed to the linear energy dispersion relation around the Dirac point and the high on/off properties associated with a sizable band gap. In addition, the gap width could be continuously tuned by manipulating strain, resulting in fascinating application potentials.

本文言語English
ページ(範囲)20747-20754
ページ数8
ジャーナルJournal of Physical Chemistry C
119
35
DOI
出版ステータスPublished - 2015 8 17

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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