Rectifying fluctuations in an optical lattice.
We have realized a Brownian motor by using cold atoms in a dissipative optical lattice as a model system. In our experiment the optical potential is spatially symmetric and the time symmetry of the system is broken by applying appropriate zero-mean ac forces. We identify a regime of rectification of forces and a regime of rectification of fluctuations, the latter corresponding to the realization of a Brownian motor.
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
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Jones
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Goonasekera
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Renzoni