Single-parameter pumping in graphene

Details Single-parameter pumping in graphene Single-parameter pumping in graphene

2011-03-29

arxiv.org/abs/1103.5597v2

Phys. Rev. B 84, 155408 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures. Published version

Scientific paper

10.1103/PhysRevB.84.155408

We propose a quantum pump mechanism based on the particular properties of graphene, namely chirality and bipolarity. The underlying physics is the excitation of evanescent modes entering a potential barrier from one lead, while those from the other lead do not reach the driving region. This induces a large nonequilibrium current with electrons stemming from a broad range of energies, in contrast to the narrow resonances that govern the corresponding effect in semiconductor heterostructures. Moreover, the pump mechanism in graphene turns out to be robust, with a simple parameter dependence, which is beneficial for applications. Numerical results from a Floquet scattering formalism are complemented with analytical solutions for small to moderate driving.

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