Signatures of a gap in the conductivity of graphene

Details Signatures of a gap in the conductivity of graphene Signatures of a gap in the conductivity of graphene

2010-05-27

arxiv.org/abs/1005.5089v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

The electrical conductivity of suspended graphene has recently been measured for the first time, and found to behave as \sigma ~ \sqrt{|n|} as expected for Dirac quasiparticles at large carrier density. The charge inhomogeneity is strongly reduced in suspended samples, which revealed an unexpected insulating trend in \sigma(T). Above a transitional density n*, the temperature dependence was found to revert to metallic. We show that these features of the DC conductivity are consistent with a simple model of gapped Dirac quasiparticles, with specific signatures of a gap in the vicinity of the charge-neutrality point. Our findings are reminiscent of the conductivity profile in semiconducting materials, exhibiting a thermal activation for T \geq \tilde T and a weakly T-dependent background for T \leq \tilde T, where \tilde T is given by the saturation density \tilde n associated with the residual charge inhomogeneity. We discuss possible origins of a bandgap in graphene as well as alternative scenarios.

Affiliated with

Also associated with

No associations

Rating

Signatures of a gap in the conductivity of graphene does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Signatures of a gap in the conductivity of graphene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signatures of a gap in the conductivity of graphene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-192599