Quantised charge pumping through multiple quantum dots

2003/07/14 by Argha Banerjee, Sourin Das, Banerjee, Argha +3
Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #cond-mat.mes-hall

paper · pdf · doi:10.48550/arxiv.cond-mat/0307324

Latex, 4 pages, 6 figures

arxiv created 2003/07/14 · arxiv updated 2009/12/01

Abstract

We study electron pumping through a system of barriers, whose heights are deformed adiabatically. We derive a simple formula for the pumped charge Q in terms of the total reflection and transmission amplitudes and phases. The pumped charge increases with the number of barriers (n_b) and shows an interesting step-like behaviour, with the steps appearing at integer values of Q. The pumped charge also tends towards quantisation with the increase of the amplitude of the time-varying potential. The value of the quantised pumped charge is shown to be correlated to the discontinuity of the reflection phase.

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