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Weakly driven quantum coherent ratchets in cold-atom systems

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Heimsoth, M. and Creffield, Charles E. and Sols Lucía, Fernando (2010) Weakly driven quantum coherent ratchets in cold-atom systems. Physical review A, 82 (2). ISSN 1050-2947

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Official URL: http://dx.doi.org/10.1103/PhysRevA.82.023607


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Abstract

We present an analytical study of the response of cold atoms in an optical lattice to a weak time- and space-asymmetric periodic driving signal. In the noninteracting limit, and for a finite set of resonant frequencies, we show how a coherent, long-lasting ratchet current results from the interference between first- and second-order processes. In those cases, a suitable three- level model can account for the entire dynamics, yielding surprisingly good agreement with numerically exact results for weak and moderately strong driving.


Item Type:Article
Additional Information:

©2010 The American Physical Society.
This work was supported by MICINN (Spain), through Grant No. FIS-2007-65723 and the Ramón y Cajal Program (CEC).

Uncontrolled Keywords:Brownian motors; Transport
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:32950
Deposited On:28 Aug 2015 11:02
Last Modified:13 Feb 2018 19:17

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