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Hidden quantum pump effects in quantum coherent rings

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Published in Physical Review. B, Condensed Matter. 2003, vol. 68, p. 075303.1-075303.8
Abstract Time periodic perturbations of an electron system on a ring are examined. For small frequencies periodic small amplitude perturbations give rise to side band currents which in leading order are inversely proportional to the frequency. These side band currents compensate the current of the central band such that to leading order no net pumped current is generated. In the non-adiabatic limit, larger pump frequencies can lead to resonant excitations: as a consequence a net pumped current arises. We illustrate our results for a one channel ring with a quantum dot whose barriers are modulated parametrically.
Keywords Mesoscopic systems and quantum hall effectCondensed matter
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MOSKALETS, Mykhaylo, BUTTIKER, Markus. Hidden quantum pump effects in quantum coherent rings. In: Physical Review. B, Condensed Matter, 2003, vol. 68, p. 075303.1-075303.8. https://archive-ouverte.unige.ch/unige:4240

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Deposited on : 2009-11-30

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