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Parametric pumping at finite frequency | | Baigeng Wang
; Jian Wang
; Hong Guo
; | | Date: |
4 Jul 2001 | | Subject: | cond-mat | | 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 $phi$. In the zero frequency limit, our theory predicts the well known result that the pumped current is proportional to $sinphi$. 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 $phi=0$, which we found to be due to photon-assisted processes. | | Source: | arXiv, cond-mat/0107078 | | Services: | Forum | Review | PDF | Favorites | |
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