Dissipation Enhanced Asymmetric Transport in Quantum Ratchets
Abstract
Quantum mechanical motionof a particle in a periodic asymmetric potential is studied theoreticallyat zero temperature.It is shown based on a semi-classical approximation thatthe tunneling probability from one local minimum to the nextbecomes asymmetric in the presence of a weak oscillating field,even though there is no average macroscopic field gradient.Dissipation enhances this asymmetry,and leads to a steady unidirectional current,resulting in a quantum ratchet system.
- Publication:
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Journal of the Physical Society of Japan
- Pub Date:
- April 1998
- DOI:
- 10.1143/JPSJ.67.1090
- arXiv:
- arXiv:cond-mat/9711045
- Bibcode:
- 1998JPSJ...67.1090T
- Keywords:
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- Condensed Matter - Statistical Mechanics;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 12 pages, 2 Figures, submitted to J. Phys. Soc. Jpn