Perturbative analysis of coherent quantum ratchets in cold atom systems

Details Perturbative analysis of coherent quantum ratchets in cold atom systems Perturbative analysis of coherent quantum ratchets in cold atom systems

2010-03-30

arxiv.org/abs/1003.5868v1

Phys. Rev. A 82, 023607 (2010)

Physics

Condensed Matter

Quantum Gases

8 pages, 6 figures

Scientific paper

We present a perturbative 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.

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