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Pumping of electrons through nano-scale devices is one of the fascinatingachievements in the field of nano-science with a wide range of applications. Tooptimize the performance of pumps, operating them at high frequencies ismandatory. We consider the influence of fast periodic driving on the averagecharge transferred through a quantum dot. We show that it is possible toreverse the average current by sweeping the driving frequency only. Inconnection with this, we observe a rectification of the average current forhigh frequencies. Since both effects are very robust, as corroborated byanalytical results for harmonic driving, they offer a new way of controllingelectron pumps.

Non-adiabatic Rectification and Current Reversal in Electron Pumps