BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 24: Dynamics and Statistical Physics - Open Session
DY 24.6: Vortrag
Dienstag, 23. März 2021, 12:40–13:00, DYb
Long-time diffusion and energy transfer in mixtures of particles with different temperatures — •Efe Ilker1,2, Michele Castellana1, and Jean-François Joanny1,3 — 1Institut Curie, Paris, France — 2Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 3Collège de France, Paris, France
In biological systems, crowding and composition are key factors affecting the rates of material transport while nonequilibrium aspects of active systems enrich this dynamics from molecular scales to cell populations. Transport properties of solute particles at long timescales differ from their short-timescale behavior due to interactions between the constituent particles. The collisions generate additional friction on a particle, while on top of that, for nonequilibrium (active) systems, the collisions can also lead to an exchange of energy between different constituents. Thus, the long-time diffusion coefficient of a tagged particle is shaped by the interplay between the effective friction and the energy transfer. Using the multiple temperature model, we probe these effects in dilute solutions and derive long-time friction and self-diffusion coefficients as a function of volume fractions, sizes and temperatures of particles. At these long timescales, we show that the tagged particle experiences a size-dependent "bath" temperature which stems from the interparticle energy transfer.