Influence of disorder on conductance in bilayer graphene under perpendicular electric field

Hisao Miyazaki, Kazuhito Tsukagoshi, Akinobu Kanda, Minoru Otani, Susumu Okada

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)

Abstract

Electron transport in bilayer graphene placed under a perpendicular electric field is revealed experimentally. Steep increase of the resistance is observed under high electric field; however, the resistance does not diverge even at low temperatures. The observed temperature dependence of the conductance consists of two contributions: the thermally activated (TA) conduction and the variable range hopping (VRH) conduction. We find that for the measured electric field range (0-1.3 V/nm) the mobility gap extracted from the TA behavior agrees well with the theoretical prediction for the band gap opening in bilayer graphene, although the VRH conduction deteriorates the insulating state more seriously in bilayer graphene with smaller mobility. These results show that the improvement of the mobility is crucial for the successful operation of the bilayer graphene field effect transistor.

Original languageEnglish
Pages (from-to)3888-3892
Number of pages5
JournalNano Letters
Volume10
Issue number10
DOIs
Publication statusPublished - 2010 Oct 13
Externally publishedYes

Keywords

  • Bilayer grapheme
  • band gap
  • disorder
  • field-effect transistor
  • localized states
  • mobility gap

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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