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DY: Fachverband Dynamik und Statistische Physik

DY 71: Poster: Noneq. Stat. Phys., Stoch. Thermo, Brownian Dyn.

DY 71.9: Poster

Donnerstag, 15. März 2018, 15:30–18:00, Poster A

Hot Brownian Motion on Short Time Scales — •Alexander Fischer and Frank Cichos — Molecular Nanophotonics, Peter-Debye-Institute, Universität Leipzig

Hot Brownian motion describes the motion of a heated microsphere in a liquid. It is a fundamental issue for thermal non-equilibrium. A temperature field is created around the heated particle decaying with 1/r and a stationary temperature and viscosity field is moving with the particle through the liquid. The non-equilibrium dynamics of the particle now differs from the unheated particles and an effective temperature and viscosity is introduced to describe the system. Here we report on a study of the fluctuations of a heated particle in an optical trap with nanosecond and nanometer resolution. We achieved to measure the accelerated motion and from that the temperature increase of our particles. The first evidence of the changing characteristic time constants on short time scales was detected.