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Controlled generation of coherent matter currents using a periodic driving field

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2008-06-25
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American Physical Society
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We study the effect of a strong, oscillating driving field on the dynamics of ultracold boson held in an optical lattice. Modeling the system as a Bose-Hubbard model, we show how the driving field can be used to produce and maintain a coherent atomic current by controlling the phase of the intersite tunneling processes. We investigate both the stroboscopic and time- averaged behavior using Floquet theory, and demonstrate that this procedure provides a stable and precise method of controlling coherent quantum systems.
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© 2008 The American Physical Society. We thank Martin Holthaus for stimulating discussions. This work was funded by the MEC (Spain) through Grant Nos. FIS2004-05120 and FIS2007-65723. C. E. C. was supported by a Ramón y Cajal Fellowship.
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