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Dissipation Enhanced Asymmetric Transport in Quantum Ratchets
Quantum mechanical motion of a particle in a periodic asymmetric potential is
studied theoretically at zero temperature. It is shown based on semi-classical
approximation that the tunneling probability from one local minimum to the next
becomes asymmetric in the presence of weak oscillating field, even though there
is no macroscopic field gradient in average. Dissipation enhances this
asymmetry, and leads to a steady unidirectional current, resulting in a quantum
ratchet system.Comment: 12 pages, 2 Figures, submitted to J. Phys. Soc. Jp