Phys. Rev. Lett. 94, 110603 (2005) [4 pages]Ratchet Effect for Cold Atoms in an Optical LatticeReceived 7 September 2004; published 22 March 2005 The possibility of realizing a directed current for a quantum particle in a flashing asymmetric potential is investigated. It is found that quantum resonances, where the value of the effective Planck constant is equal to an integer or half-integer multiple of π, give rise to a directed current. The effect should be readily observable in experiments. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.110603
DOI:
10.1103/PhysRevLett.94.110603
PACS:
05.60.Gg, 03.75.Lm
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