Fluctuation-induced drift in a gravitationally tilted optical lattice [Elektronisk resurs]

Zelan, Martin 1981- (författare)

Hagman, Henning 1981- (författare)

Karlsson, Kristoffer (författare)

Dion, Claude (författare)

Kastberg, Anders 1963- (författare)

Umeå universitet Teknisk-naturvetenskapliga fakulteten (utgivare)

2010
Engelska.
Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - 1063-651X. ; 82:3, 031136

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Experimental and theoretical studies are made of Brownian particles trapped in a periodic potential, which is very slightly tilted due to gravity. In the presence of fluctuations, these will trigger a measurable average drift along the direction of the tilt. The magnitude of the drift varies with the ratio between the bias force and the trapping potential. This can be closely compared to a theoretical model system, based on a Fokker-Planck equation formalism. We show that the level of control and measurement precision we have in our system, which is based on cold atoms trapped in a three-dimensional dissipative optical lattice, makes the experimental setup suitable as a testbed for fundamental statistical physics. We simulate the system with a very simplified and general classical model, as well as with an elaborate semiclassical Monte Carlo simulation. In both cases, we achieve good qualitative agreement with experimental data.

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Fler titlar av: Zelan, Martin 1981-; Hagman, Henning 1981 ...; Karlsson, Kristoffer; Dion, Claude; Kastberg, Anders 196 ...; Umeå universitet Tek ...
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