Dissipation Enhanced Asymmetric Transport in Quantum Ratchets

Details Dissipation Enhanced Asymmetric Transport in Quantum Ratchets Dissipation Enhanced Asymmetric Transport in Quantum Ratchets

1997-11-06

arxiv.org/abs/cond-mat/9711045v1

Physics

Condensed Matter

Statistical Mechanics

12 pages, 2 Figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.67.1090

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.

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