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Gate driven adiabatic quantum pumping in graphene

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<mark>Journal publication date</mark>08/2011
<mark>Journal</mark>Solid State Communications
Issue number16
Volume151
Number of pages6
Pages (from-to)1065-1070
Publication StatusPublished
Early online date20/05/11
<mark>Original language</mark>English

Abstract

We propose a new type of quantum pump made out of graphene, adiabatically driven by oscillating voltages applied to two back gates. From a practical point of view, graphene-based quantum pumps present advantages as compared to normal pumps, like enhanced robustness against thermal effects and a wider adiabatic range in driving frequency. From a fundamental point of view, apart from conventional pumping through propagating modes, graphene pumps can tap into evanescent modes, which penetrate deeply into the device as a consequence of chirality. At the Dirac point the evanescent modes dominate pumping and give rise to a universal response under weak driving for short and wide pumps, even though the charge per unit cycle is not quantized.