Driven Ratchets for Cold Atoms

Details Driven Ratchets for Cold Atoms Driven Ratchets for Cold Atoms

2011-12-05

arxiv.org/abs/1112.0851v1

Advances In Atomic Molecular and Optical Physics 57, 1-32 (2009)

Physics

Condensed Matter

Statistical Mechanics

arXiv admin note: text overlap with arXiv:cond-mat/0610262 and arXiv:cond-mat/0512550

Scientific paper

10.1016/S1049-250X(09)57001-2

Brownian motors, or ratchets, are devices which "rectify" Brownian motion, i.e. they can generate a current of particles out of unbiased fluctuations. The ratchet effect is a very general phenomenon which applies to a wide range of physical systems, and indeed ratchets have been realized with a variety of solid state devices, with optical trap setups as well as with synthetic molecules and granular gases. The present article reviews recent experimental realizations of ac driven ratchets with cold atoms in driven optical lattices. This is quite an unusual system for a Brownian motor as there is no a real thermal bath, and both the periodic potential for the atoms and the fluctuations are determined by laser fields. Such a system allowed us to realize experimentally rocking and gating ratchets, and to precisely investigate the relationship between symmetry and transport in these ratchets, both for the case of periodic and quasiperiodic driving.

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