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DY: Fachverband Dynamik und Statistische Physik
DY 6: Statistical Physics far from Thermal Equilibrium I
DY 6.10: Vortrag
Montag, 18. März 2024, 12:15–12:30, BH-N 334
Thermophoresis and the breakdown of local equilibrium in a far-from-equilibrium bath — •Wade Hodson1 and Aljaz Godec2 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 2Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
We investigate the nonequilibrium steady state properties of a far-from-equilibrium bath, consisting of a chain of harmonic oscillators coupled at the ends to stochastic heat reservoirs at different temperatures. This system, if coupled to a tracer particle, can serve as a medium in which the tracer diffuses in response to the applied thermal gradient, a phenomenon known as thermophoresis. We evaluate interparticle correlations, time-integrated heat current statistics, and other diagnostic properties of the harmonic bath to study how local thermal equilibrium breaks down for large temperature gradients, a regime where thermophoresis still lacks a general theoretical description. These analytical results are supplemented by numerical computations. We also present a preliminary analysis of the effect of the bath on a tracer using the Kac-Zwanzig formalism, which produces an effective equation of motion for the tracer alone.
Keywords: Thermophoresis; Far-from-equilibrium; Nonequilibrium steady states; Harmonic systems; Kac-Zwanzig model