Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Quantum chaos II

DY 21.8: Vortrag

Donnerstag, 26. März 2009, 12:15–12:30, ZEU 255

Underdamped quantum ratchets — •Sergey Denisov, Sigmund Kohler, and Peter Hänggi — Universitat Augsburg,Universitätsstrasse 1, D-86135 Augsburg, Germany

We investigate the quantum ratchet effect under the influence of weak dissipation which we treat within a Floquet-Markov master equation approach. A ratchet current emerges when all relevant symmetries are violated. Using time-reversal symmetric driving we predict a purely dissipation-induced quantum ratchet current. This directed quantum transport results from bath-induced superpositions of non-transporting Floquet states.