Chaotic filtering of moving atoms in pulsed optical lattices by control of dynamical localization |
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Authors: | Jonckheere T Isherwood M R Monteiro T S |
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Institution: | Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom. |
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Abstract: | We propose a mechanism for a velocity-selective device which would allow packets of cold atoms traveling in one direction through a pulsed optical lattice to pass undisturbed, while dispersing atoms traveling in the opposite direction. The mechanism is generic and straightforward: for a simple quantum kicked rotor pulsed with unequal periods, the quantum suppression of momentum diffusion (dynamical localization) yields momentum localization lengths L which are no longer isotropic, as in the standard case, but vary smoothly and controllably with initial momentum. |
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