Unified description of the dc conductivity of monolayer and bilayer graphene at finite densities based on resonant scatterers

Details Unified description of the dc conductivity of monolayer and bilayer graphene at finite densities based on resonant scatterers Unified description of the dc conductivity of monolayer and bilayer graphene at finite densities based on resonant scatterers

2010-10-19

arxiv.org/abs/1010.4026v2

Phys. Rev. B 83, 165402 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

25 pages, 13 figures. published version: appendixes improved, references added, abstract and title slightly changed, plus othe

Scientific paper

10.1103/PhysRevB.83.165402

We show that a coherent picture of the dc conductivity of monolayer and bilayer graphene at finite electronic densities emerges upon considering that strong short-range potentials are the main source of scattering in these two systems. The origin of the strong short-range potentials may lie in adsorbed hydrocarbons at the surface of graphene. The equivalence among results based on the partial-wave description of scattering, the Lippmann-Schwinger equation, and the T-matrix approach is established. Scattering due to resonant impurities close to the neutrality point is investigated via a numerical computation of the Kubo formula using a kernel polynomial method. We find that relevant adsorbate species originate impurity bands in monolayer and bilayer graphene close to the Dirac point. In the midgap region, a plateau of minimum conductivity of about $e^2/h$ (per layer) is induced by the resonant disorder. In bilayer graphene, a large adsorbate concentration can develop an energy gap between midgap and high-energy states. As a consequence, the conductivity plateau is supressed near the edges and a "conductivity gap" takes place. Finally, a scattering formalism for electrons in biased bilayer graphene, taking into account the degeneracy of the spectrum, is developed and the dc conductivity of that system is studied.

Affiliated with

Also associated with

No associations

Rating

Unified description of the dc conductivity of monolayer and bilayer graphene at finite densities based on resonant scatterers 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 Unified description of the dc conductivity of monolayer and bilayer graphene at finite densities based on resonant scatterers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unified description of the dc conductivity of monolayer and bilayer graphene at finite densities based on resonant scatterers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-716661