Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.34: Poster

Montag, 26. März 2012, 15:00–19:00, Poster B

Current fluctuations in capacitively coupled double quantum dots — •Robert Hussein and Sigmund Kohler — Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain

Based on a recent work [1], we study a coherent quantum ratchet that is driven by tunnel oscillations. It is realised by two capacitively coupled double quantum dots — the driving circuit is biased but undetuned, while the ratchet circuit is detuned but unbiased. We investigate the full counting statistics (FCS) of both subsystems and compare the results to those of an effective master equation in which the driving circuit is eliminated. While higher order cumulants exhibit discrepancies, Fano factor, skewness and kurtosis are in good agreement.

[1] M. Stark and S. Kohler, EPL 91, 20007 (2010)