Quantum pumping in graphene

Details Quantum pumping in graphene Quantum pumping in graphene

2009-07-09

arxiv.org/abs/0907.1568v2

Phys. Rev. B 80, 245414 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures. Published version

Scientific paper

10.1103/PhysRevB.80.245414

We show that graphene-based quantum pumps can tap into evanescent modes, which penetrate deeply into the device as a consequence of Klein tunneling. The evanescent modes dominate pumping at the Dirac point, and give rise to a universal response under weak driving for short and wide pumps, in close analogy to their role for the minimal conductivity in ballistic transport. In contrast, evanescent modes contribute negligibly to normal pumps. Our findings add a new incentive for the exploration of graphene-based nanoelectronic devices.

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