Observation of an electric-field-induced band gap in bilayer graphene by infrared spectroscopy

Kin Fai Mak, Chun Hung Lui, Jie Shan, Tony F. Heinz

Research output: Contribution to journalArticlepeer-review

458 Scopus citations

Abstract

It has been predicted that application of a strong electric field perpendicular to the plane of bilayer graphene can induce a significant band gap. We have measured the optical conductivity of bilayer graphene with an efficient electrolyte top gate for a photon energy range of 0.2-0.7 eV. We see the emergence of new transitions as a band gap opens. A band gap approaching 200 meV is observed when an electric field ∼1V/nm is applied, inducing a carrier density of about 1013cm-2. The magnitude of the band gap and the features observed in the infrared conductivity spectra are broadly compatible with calculations within a tight-binding model.

Original languageEnglish (US)
Article number256405
JournalPhysical review letters
Volume102
Issue number25
DOIs
StatePublished - Jun 26 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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