Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.220601
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Funding
- National Science Foundation
- CAREER [0239764]
- NSF IGERT [DGE-0549503]
- Engineering and Technology Industry Council of Oregon
- Direct For Mathematical & Physical Scien
- Division Of Physics [0239764] Funding Source: National Science Foundation
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A flashing ratchet transports diffusive particles using a time-dependent, asymmetric potential. The particle speed is predicted to increase when a feedback algorithm based on the particle position is used. We have experimentally realized such a feedback ratchet using an optical line trap, and observed that use of feedback increases velocity by up to an order of magnitude. We compare two different feedback algorithms for small particle numbers, and find good agreement with simulations. We also find that existing algorithms can be improved to be more tolerant to feedback delay times.
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