Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Transport: Poster Session
TT 22.14: Poster
Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B
Theoretical and experimental investigations of Coulomb blockade in coupled quantum dot systems — •Franz J. Kaiser1, Sigmund Kohler1, Peter Hänggi1, Marcin Malecha1, Jens Ebbecke1,2, and Achim Wixforth1 — 1Institut für Physik, Universität Augsburg, D-86135 Augsburg — 2School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
We investigate the electron transport through coupled quantum dots in a ratchet like geometry. Our experimental observations of the ‘Coulomb diamonds’ at low temperatures are supported by a theoretical description, where we compare the results from scattering theory with those of a master equation approach for strong interaction [1]. Moreover, we characterize in each case the shot noise by the Fano factor and identify our experimental findings of sub structures in the Coulomb diamonds as being related to the orbital degrees of freedom. We find very good agreement for the strongly interacting case.
[1] F.J. Kaiser, M. Strass, S. Kohler, and P. Hänggi, Chem. Phys. 322, 193 (2006)