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

A modified fluctuation-dissipation theorem for a nonequilibrium steady state is experimentally checked by studying the position fluctuations of a colloidal particle whose motion is confined in a toroidal optical trap. The nonequilibrium steady state is generated by means of a rotating laser beam whi...

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Bibliographic Details
Published in:Physical review letters 2009-07, Vol.103 (4), p.040601-040601, Article 040601
Main Authors: Gomez-Solano, J R, Petrosyan, A, Ciliberto, S, Chetrite, R, Gawedzki, K
Format: Article
Language:English
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Summary:A modified fluctuation-dissipation theorem for a nonequilibrium steady state is experimentally checked by studying the position fluctuations of a colloidal particle whose motion is confined in a toroidal optical trap. The nonequilibrium steady state is generated by means of a rotating laser beam which exerts on the particle a sinusoidal conservative force plus a constant nonconservative one. The modified fluctuation-dissipation theorem is perfectly verified by the experimental data. It can be interpreted as an equilibriumlike fluctuation-dissipation relation in the Lagrangian frame of the mean local velocity of the particle.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.103.040601