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Title: Quantum ratchet accelerator without a bichromatic lattice potential
Authors: Wang, J. 
Gong, J. 
Issue Date: 19-Sep-2008
Citation: Wang, J., Gong, J. (2008-09-19). Quantum ratchet accelerator without a bichromatic lattice potential. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 78 (3) : -. ScholarBank@NUS Repository.
Abstract: In a quantum ratchet accelerator system, a linearly increasing directed current can be dynamically generated without using a biased field. Generic quantum ratchet acceleration with full classical chaos constitutes a new element of quantum chaos and an interesting violation of a sum rule of classical ratchet transport. Here we propose a simple quantum ratchet accelerator model that can also generate linearly increasing quantum current with full classical chaos. This model does not require a bichromatic lattice potential. It is based on a variant of an on-resonance kicked-rotor system, periodically kicked by two optical lattice potentials of the same lattice constant, but with unequal amplitudes and a fixed phase shift between them. The dependence of the ratchet current acceleration rate on the system parameters is studied in detail. The cold-atom version of our quantum ratchet accelerator model should be realizable by introducing slight modifications to current cold-atom experiments. © 2008 The American Physical Society.
Source Title: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
ISSN: 15393755
DOI: 10.1103/PhysRevE.78.036219
Appears in Collections:Staff Publications

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