2001/07/04 by Baigeng Wang, Jian Wang, Hong Guo
Physics and Astronomy · #Mechanical and Optical Resonators #Quantum and electron transport phenomena #Spectroscopy and Quantum Chemical Studies #cond-mat
paper · pdf · doi:10.1103/physrevb.65.073306
arxiv created 2001/07/04 · openalex publication_date 2002/01/25 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report a first-principles theory for analyzing the parametric electron pump at finite frequency. The pump is controlled by two pumping parameters with phase difference \ensuremathφ. In the zero-frequency limit, our theory recovers the well-known adiabatic result that the pumped current I(\ensuremathφ)\ensuremath∼sin\ensuremathφ. At a finite frequency, it predicts I(\ensuremathφ=0)\ensuremath≠0 while I(\ensuremathφ=\ensuremathπ)\ensuremath≈0, consistent with recent experimental data. We discuss a possible mechanism behind the nonzero pumped current at \ensuremathφ=0 from photon-assisted processes.