Deterministic ratchet from stationary light fields

Details Deterministic ratchet from stationary light fields Deterministic ratchet from stationary light fields

2009-05-25

arxiv.org/abs/0905.3796v1

Phys. Rev. Lett. 103, 130601 (2009)

Physics

Condensed Matter

Other Condensed Matter

6 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.130601

Ratchets are dynamic systems where particle transport is induced by zero-average forces due to the interplay between nonlinearity and asymmetry. Generally, they rely on the effect of a strong external driving. We show that stationary optical lattices can be designed to generate particle flow in one direction while requiring neither noise nor driving. Such optical fields must be arranged to yield a combination of conservative (dipole) and nonconservative (radiation pressure) forces. Under strong friction all paths converge to a discrete set of limit periodic trajectories flowing in the same direction.

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