Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.24: Poster

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

Quantum transport through coupled quantum dots attached to a Large spin — •Klemens Mosshammer, Gerold Kiesslich, and Tobias Brandes — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin

We investigate theoretically the magneto-transport through a system of two coupled single level quantum dots, connected to ferromagnetic leads, where the electron spin is coupled to an external (pseudo-)spin via an exchange interaction, introducing non-linear dynamics. The system is examined using a semi-classical technique in combination with a quantum master equation approach to describe the sequential tunneling trough the system. We find regimes where the average current through the quantum dot system displays self-sustained oscillations reflecting limit-cycles behaviour of the transport electrons.