Many-body quantum ratchet in a Bose-Einstein condensate

Details Many-body quantum ratchet in a Bose-Einstein condensate Many-body quantum ratchet in a Bose-Einstein condensate

2006-09-21

arxiv.org/abs/cond-mat/0609535v1

Phys. Rev. A 76, 023421 (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.76.023421

We study the dynamics of a dilute Bose-Einstein condensate confined in a toroidal trap and exposed to a pair of periodically flashed optical lattices. We first prove that in the noninteracting case this system can present a quantum symmetry which forbids the ratchet effect classically expected. We then show how many-body atom-atom interactions, treated within the mean-field approximation, can break this quantum symmetry, thus generating directed transport.

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