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arXiv · 0903.1075

Experimental verification of a modified fluctuation-dissipation relation for a micron-sized particle in a non-equilibrium steady state

Juan Ruben Gomez-Solano·Artyom Petrosyan·Sergio Ciliberto·Raphael Chetrite·Krzysztof Gawedzki
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Abstract

A modified fluctuation-dissipation-theorem (MFDT) for a non-equilibrium steady state (NESS) is experimentally checked by studying the position fluctuations of a colloidal particle whose motion is confined in a toroidal optical trap. The NESS is generated by means of a rotating laser beam which exerts on the particle a sinusoidal conservative force plus a constant non-conservative one. The MFDT is shown to be perfectly verified by the experimental data. It can be interpreted as an equilibrium-like fluctuation-dissipation relation in the Lagrangian frame of the mean local velocity of the particle.

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Juan Ruben Gomez-Solano, Artyom Petrosyan, Sergio Ciliberto, Raphael Chetrite, Krzysztof Gawedzki. 2009-06-23. Experimental verification of a modified fluctuation-dissipation relation for a micron-sized particle in a non-equilibrium steady state. https://doi.org/10.1103/physrevlett.103.040601

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