Temperature dependence of the conductivity of ballistic graphene

Details Temperature dependence of the conductivity of ballistic graphene Temperature dependence of the conductivity of ballistic graphene

2008-12-22

arxiv.org/abs/0812.4141v2

Phys. Rev. Lett. 103, 196801 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Discussion of interaction effects and the two kinds of Fabry-Perot resonances added

Scientific paper

10.1103/PhysRevLett.103.196801

We investigate the temperature dependence of the conductivity in ballistic graphene using Landauer transport theory. We obtain results which are qualitatively in agreement with many features recently observed in transport measurements on high mobility suspended graphene. The conductivity \sigma at high temperature T and low density n grows linearly with T, while at high n we find \sigma ~ |n|^1/2 with negative corrections at small T due to the T-dependence of the chemical potential. At moderate densities the conductivity is a non-monotonic function of T and n, exhibiting a minimum at T=0.693 \hbar v |n|^1/2 where v is the Fermi velocity. We discuss two kinds of Fabry-Perot oscillations in short nanoribbons and their stability at finite temperatures.

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