Electron delocalization in bilayer graphene induced by an electric field

Mikito Koshino

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Electronic localization is numerically studied in disordered bilayer graphene with an electric-field-induced energy gap. Bilayer graphene is a zero-gap semiconductor, in which an energy gap can be opened and controlled by an external electric field perpendicular to the layer plane. We found that, in the smooth disorder potential not mixing the states in different valleys (K and K′ points), the gap opening causes a phase transition at which the electronic localization length diverges. We show that this can be interpreted as the integer quantum Hall transition at each single valley, even though the magnetic field is absent.

Original languageEnglish
Article number155411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number15
DOIs
Publication statusPublished - 2008 Oct 9

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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