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DY: Fachverband Dynamik und Statistische Physik

DY 11: Quantum Dynamics, Decoherence, and Quantum Information II

DY 11.1: Topical Talk

Dienstag, 23. März 2010, 14:00–14:30, H38

AC-driven quantum systems: cold atom ratchets and beyond — •Sergey Denisov — Institut fur Physik, Universitat Augsburg, Univeritatsstr. 1, 86135 Augsburg

I will start with a short introduction by using a simple model of an ac-driven quantum particle in a pulsating periodic potential ("flashing quantum ratchet"), and discuss the main mechanisms of current rectification. I will then present results on the theoretical treatment of the problem [1, 2], specify quantum features, and review the recent experimental realization of the quantum flashing ratchet with ultracold atoms [3]. Finally I will discussed two important issues: (i) the ability of coherent ac-driven quantum motors to perform a work against a constant bias and (ii) the performance of quantum motors in the presence of decoherence.

[1] S. Denisov, L. Morales-Molina, S. Flach, and P. Hanggi, Phys. Rev. A 75, 240604 (2006).

[2] A. V. Ponomarev, S. Denisov, and P. Hanggi, Phys. Rev. Lett. 102, 230601 (2009).

[3] T. Salger et al., Science 326, 1241 (2009).