Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.4: Poster

Mittwoch, 16. März 2011, 14:00–18:00, P3

Effects of Coulomb interaction on the dynamics of an open quantum dot system — •Benjamin Baxevanis and Daniela Pfannkuche — I. Institut für Theoretische Physik, Universität Hamburg

We study the effect of Coulomb interaction on the time-dependent dynamics of a quantum dot system weakly coupled to an electronic reservoir. The two systems are assumed to be initially separated and we calculate the evolution from a non-equilibrium state to equilibrium as the interaction between the systems is instantly switched on. We determine the current flow from the reservoir to the single quantum dot in the sequential tunnelling regime using a master equation. The exact eigenstates of a finite number of correlated electrons in the quantum dot are taken into account provided by the exact-diagonalization method. We discuss the significance of the few-particle states which are involved in the charging of the quantum dot. We encounter signatures of Coulomb blockade in the transient regime of the current-voltage characteristics which emerged in recent experiments [1].
B. Marquardt, M. Geller, B. Baxevanis, D. Pfannkuche, A. D. Wieck, D. Reuter, A. Lorke, preprint arXiv:1007.0392