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 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.
Gomez-Solano
J R
JR
Université de Lyon, Laboratoire de Physique, Ecole Normale Supérieure de Lyon, CNRS, 69364 Lyon CEDEX 07, France.
Petrosyan
A
A
Ciliberto
S
S
Chetrite
R
R
Gawedzki
K
K