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Single-parameter pumping in graphene

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Article number155408
<mark>Journal publication date</mark>11/10/2011
<mark>Journal</mark>Physical review B
Issue number15
Volume84
Number of pages0
Publication StatusPublished
<mark>Original language</mark>English

Abstract

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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©2011 American Physical Society