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Statistically Locked-In Transport through Periodic Potential Landscapes

2004; American Physical Society; Volume: 92; Issue: 13 Linguagem: Inglês

10.1103/physrevlett.92.130602

1092-0145

Ajay Gopinathan, David G. Grier,

Cold Atom Physics and Bose-Einstein Condensates

Classical particles driven through periodically modulated potential energy landscapes are predicted to follow a devil's staircase hierarchy of commensurate trajectories depending on the orientation of the driving force. Recent experiments on colloidal spheres flowing through arrays of optical traps do indeed reveal such a hierarchy, but not with the predicted structure. The microscopic trajectories, moreover, appear to be random, with commensurability emerging only in a statistical sense. We introduce an idealized model for periodically modulated transport in the presence of randomness that captures both the structure and statistics of such statistically locked-in states.