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DY: Fachverband Dynamik und Statistische Physik
DY 41: Brownian Motion, Stochastic Processes, Transport II
DY 41.1: Talk
Friday, March 18, 2011, 10:15–10:30, HÜL 186
Effective temperatures in hot Brownian motion — •Daniel Rings1, Dipanjan Chakraborty1, Markus Selmke2, Frank Cichos2, and Klaus Kroy1 — 1ITP, University of Leipzig, Germany — 2EXP1, University of Leipzig, Germany
Recently, we have introduced a theoretical model for the Brownian motion of heated nanoparticles in suspension [1], which successfully passed its first test in photothermal spectroscopy experiments [2].
Now, we wish to shed light on various aspects of the non-equilibrium phenomenon of hot Brownian motion, in particular the implications of the generalized concept of temperature with respect to translational and rotational diffusion, and dynamic effects. Different temperatures must be assigned to different modes of motion in this non-equilibrium system. I shall present results based on both the analytical theory of fluctuating hydrodynamics and molecular dynamics simulations.
[1] D. Rings, R. Schachoff, M. Selmke, F. Cichos, and K. Kroy, Phys. Rev. Lett., 105 (9), 090604 (2010)
[2] R. Radünz, D. Rings, K. Kroy, and F. Cichos, J. Phys. Chem. A 113 (9), 1674-1677 (2009)