Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: TR: Fluctuations and Noise

TT 3.1: Vortrag

Montag, 22. März 2010, 10:15–10:30, H20

Interactions, Coherence, and Multistability in Transport Statistics of coupled Quantum Dots — Gernot Schaller, •Gerold Kiesslich, and Tobias Brandes — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin

We present a novel generalized coarse-graining n-resolved master equation technique [1]. By introducing a virtual detector counting the number of transferred electrons in single-electron transport the coherences and the Lamb shift can be conveniently included. For illustration, we consider transport through interacting levels that are either serially or parallely coupled to two leads. We show for the parallel setup that the coherences can lead to strong current suppression, giant Fano factors and bistable transport statistics. In the serial case a finite coarse graining time can resolve the shortcomings of the Born-Markov-secular approximation such as unphysical currents.

[1] G. Schaller, G. Kießlich, and T. Brandes, in press, Phys. Rev. B, arXiv:0908.3620