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Parametric pumping at finite frequency

Baigeng Wang·Jian Wang·Hong Guo
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Abstract

We report on a first principles theory for analyzing the parametric electron pump at a finite frequency. The pump is controlled by two pumping parameters with phase difference $ϕ$. In the zero frequency limit, our theory predicts the well known result that the pumped current is proportional to $\sinϕ$. For the more general situation of a finite frequency, our theory predicts a non-vanishing pumped current even when the two driving forces are in phase, in agreement with the recent experimental results. We present the physical mechanism behind the nonzero pumped current at $ϕ=0$, which we found to be due to photon-assisted processes.

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Baigeng Wang, Jian Wang, Hong Guo. 2001-07-04. Parametric pumping at finite frequency. https://doi.org/10.1103/physrevb.65.073306

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