Volume 85, Number 4, February 2009
|Number of page(s)||5|
|Published online||18 February 2009|
Underdamped quantum ratchets
Institut für Physik, Universität Augsburg - Universitätsstraße 1, D-86135 Augsburg, Germany, EU
Accepted: 21 January 2009
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.
PACS: 05.60.Gg – Quantum transport / 37.10.Jk – Atoms in optical lattices / 05.45.Mt – Quantum chaos; semiclassical methods
© EPLA, 2009
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