Peierls-type instability and tunable band gap in functionalized graphene

D. A. Abanin, A. V. Shytov, L. S. Levitov

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57 Scopus citations

Abstract

Functionalizing graphene was recently shown to have a dramatic effect on the electronic properties of this material. Here we investigate spatial ordering of adatoms driven by the RKKY-type interactions. In the ordered state, which arises via a Peierls-instability-type mechanism, the adatoms reside mainly on one of the two graphene sublattices. Bragg scattering of electron waves induced by sublattice symmetry breaking results in a band gap opening, whereby Dirac fermions acquire a finite mass. The band gap is found to be immune to the adatoms' positional disorder, with only an exponentially small number of localized states residing in the gap. The gapped state is stabilized in a wide range of electron doping. Our findings show that controlled adsorption of adatoms or molecules provides a route to engineering a tunable band gap in graphene.

Original languageEnglish (US)
Article number086802
JournalPhysical review letters
Volume105
Issue number8
DOIs
StatePublished - Aug 18 2010

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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