Experimental realization of quantum-resonance ratchets at arbitrary quasimomenta

I. Dana, V. Ramareddy, I. Talukdar, G. S. Summy

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Quantum-resonance ratchets associated with the kicked particle are experimentally realized for arbitrary quasimomentum using a Bose-Einstein condensate (BEC) exposed to a pulsed standing light wave. The ratchet effect for general quasimomentum arises even though both the standing-wave potential and the initial state of the BEC have a point symmetry. The experimental results agree well with theoretical ones which take into account the finite quasimomentum width of the BEC. In particular, this width is shown to cause a suppression of the ratchet acceleration for exactly resonant quasimomentum, leading to a saturation of the directed current.

Original languageEnglish
Article number024103
JournalPhysical Review Letters
Issue number2
StatePublished - 18 Jan 2008


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