Many-body quantum ratchet in a Bose-Einstein condensate

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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.
4 pages, 4 figures

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Other Condensed Matter, Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/137397

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0609535
 http://arxiv.org/abs/cond-mat/0609535
 Phys. Rev. A 76, 023421 (2007)
 doi:10.1103/PhysRevA.76.023421

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arXiv