Details

Autor(en) / Beteiligte

• Gomez-Solano, J. R
• Bellon, L
• Petrosyan, A
• Ciliberto, S

Titel

Steady-state fluctuation relations for systems driven by an external random force

Ist Teil von

• Europhysics letters, 2010-03, Vol.89 (6), p.60003

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We experimentally study the fluctuations of the work done by an external Gaussian random force on two different stochastic systems coupled to a thermal bath: a colloidal particle in an optical trap and an atomic-force microscopy cantilever. We determine the corresponding probability density functions for different random forcing amplitudes ranging from a small fraction to several times the amplitude of the thermal noise. In both systems for sufficiently weak forcing amplitudes the work fluctuations satisfy the usual steady-state fluctuation theorem. As the forcing amplitude drives the system far from equilibrium, deviations of the fluctuation theorem increase monotonically. The deviations can be recasted to a single master curve which only depends on the kind of stochastic external force.