Single-parameter pumping in graphene

San Jose, Pablo and Prada, Elsa and Kohler, Sigmund and Schomerus, Henning (2011) Single-parameter pumping in graphene. Physical review B, 84 (15): 155408. ISSN 1550-235X

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
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©2011 American Physical Society
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Deposited On:
30 Nov 2011 09:59
Last Modified:
15 Jul 2024 12:32