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Non-adiabatic Rectification and Current Reversal in Electron Pumps

Pumping of electrons through nano-scale devices is one of the fascinating achievements in the field of nano-science with a wide range of applications. To optimize the performance of pumps, operating them at high frequencies is mandatory. We consider the influence of fast periodic driving on the average charge transferred through a quantum dot. We show that it is possible to reverse the average current by sweeping the driving frequency only. In connection with this, we observe a rectification of the average current for high frequencies. Since both effects are very robust, as corroborated by analytical results for harmonic driving, they offer a new way of controlling electron pumps.

preprint2012arXivOpen access
Alexander CroyUlf Saalmann
cond-mat.mes-hall
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Open access2 authors1 topic
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Alexander CroyUlf Saalmann

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