Quantum pumping in a ballistic graphene bilayer

Details Quantum pumping in a ballistic graphene bilayer Quantum pumping in a ballistic graphene bilayer

2010-09-06

arxiv.org/abs/1009.1033v2

Phys. Rev. B 82, 205432 (2010) [6 pages]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.82.205432

We investigate quantum pumping of massless Dirac fermions in an ideal (impurity free) double layer of graphene. The pumped current is generated by adiabatic variation of two gate voltages in the contact regions to a weakly doped double graphene sheet. At the Dirac point and for a wide bilayer with width W much larger then length L, we find that the pumped current scales linearly with the interlayer coupling length l_{perp} for L/l_{perp} << 1, is maximal for L/l_{perp} ~ 1, and crosses over to a log(L/l_{perp})/(L/l_{perp})-dependence for L/l_{perp} >> 1. We compare our results with the behavior of the conductance in the same system and discuss their experimental feasibility.

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