Gate driven adiabatic quantum pumping in graphene |
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Authors: | E Prada P San-Jose |
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Institution: | a Instituto de Ciencia de Materiales de Madrid (CSIC), Cantoblanco, E-28049 Madrid, Spainb Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spainc Department of Physics, Lancaster University, Lancaster LA1 4YB, UK |
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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. |
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Keywords: | A Thin fims A Metals B Nanofabrications D Electronic transport |
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