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Ratchet effect for cold atoms in an optical lattice | | Emil Lundh
; Mats Wallin
; | | Date: |
8 Sep 2004 | | Subject: | Other | cond-mat.other | | Affiliation: | KTH, Sweden | | Abstract: | The realization of a directed current for a quantum particle in a flashing asymmetric potential is studied. It is found that a positive current, i.e. in the direction expected for a conventional diffusive ratchet, can be attained at short times in the limit where the potential is weak and quantum diffusion dominates, while current reversal is obtained for stronger potentials. A single parameter, the ratio between the kicking frequency and the optical lattice potential strength, determines both the degree to which quantum effects dominate, and the possibility of obtaining a ratchet current. The effect should be readily observable in experiments. | | Source: | arXiv, cond-mat/0409185 | | Other source: | [GID 970469] pmid15903839 | | Services: | Forum | Review | PDF | Favorites | |
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