Controlling the Momentum Current of an Off-resonant Ratchet
| Autor: | Shrestha, R. K., Ni, J., Lam, W. K., Wimberger, S., Summy, G. S. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 86, 043617(2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.86.043617 |
| Popis: | We experimentally investigate the phenomenon of a quantum ratchet created by exposing a Bose-Einstein Condensate to short pulses of a potential which is periodic in both space and time. Such a ratchet is manifested by a directed current of particles, even though there is an absence of a net bias force. We confirm a recent theoretical prediction [M. Sadgrove and S. Wimberger, New J. Phys. \textbf{11}, 083027 (2009)] that the current direction can be controlled by experimental parameters which leave the underlying symmetries of the system unchanged. We demonstrate that this behavior can be understood using a single variable containing many of the experimental parameters and thus the ratchet current is describable using a single universal scaling law. Comment: arXiv admin note: substantial text overlap with arXiv:1210.5657 |
| Databáze: | arXiv |
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