Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 51: Einstein Symposium Brownian Motion, Diffusion and Beyond (SYBM) – Contributed Talks II

DY 51.3: Vortrag

Mittwoch, 9. März 2005, 10:45–11:00, TU H2032

Experimental Verification of the Fluctuation Theorem for a Chemical Rate Equation — •Sebastian Schuler, Carsten Tietz, Thomas Speck, Udo Seifert, and Jörg Wrachtrup — Institute of Physics, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart

A non-linear fluctuation theorem for systems described by chemical master equations driven out of equilibrium is experimentally verified. In [1] starting out from Jarzynski’s relation the fluctuation theorem is derived for transitions between n states. For experimental verification an optical 2-level system was used.

Defect centres in diamond can be switched from a fluorescent to a non-fluorescent state by illumination with red light (680 nm). By appliance of green light (514 nm) the system is switched back to its fluorescent state. Altering the intensity of the used wavelength changes the transition rates between bright and dark state.

While the system is driven out of equilibrium by introducing a time dependant transition rate the effect on the fluorescence is measured.

[1] U. Seifert J. Phys. A 37, L517 (2004)