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DY: Fachverband Dynamik und Statistische Physik

DY 55: Poster: Noneq. Stat. Phys., Stat. Bio. Phys., Brownian

DY 55.4: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster B2

Hot Brownian Motion on Short Time Scales — •Xiaoya Su — Molecular Nanophotonics, Peter Debye Institute for Soft Matter Physics, University Leipzig, Linnéstraße 5, 04103, 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 calculated the mean squared displacement MSD and the autocorrelation function of velocity(VACF) of the heated particle and found evidence that the short time motion is influenced by the temperature increase.