Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-05-31
Phys. Rev. A 84, 043617 (2011)
Physics
Condensed Matter
Quantum Gases
6 pages; 3 figures; 1 table
Scientific paper
10.1103/PhysRevA.84.043617
We analyze the performance of quantum ratchets by considering the dynamics of an initially localized wave packet loaded into a flashing periodic potential. The directed center-of-mass motion can be initiated by the uniform modulation of the potential height, provided that the modulation protocol breaks all relevant time- and spatial reflection symmetries. A poor performance of quantum ratchet transport is characterized by a slow net motion and a fast diffusive spreading of the wave packet, while the desirable optimal performance is the contrary. By invoking a quantum analog of the classical P\'eclet number, namely the quotient of the group velocity and the dispersion of the propagating wave packet, we calibrate the transport properties of flashing quantum ratchets and discuss the mechanisms that yield low-dispersive directed transport.
Denisov Sergey
Hänggi Peter
Ponomarev Alexey V.
Zhan Fei
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