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DY: Fachverband Dynamik und Statistische Physik

DY 12: Statistical Physics far from Thermal Equilibrium II

DY 12.7: Talk

Monday, March 18, 2024, 16:30–16:45, BH-N 334

Phase behavior of particles with different temperatures — •Amir Abbasi and Roland R. Netz — Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

A well-known phenomenon in nonequilibrium thermodynamics is the phase separation in mixtures of hot and cold particles with purely repulsive interactions, coupled to heat baths at different temperatures [1-2]. Theoretical studies have explored this separation, often using the concept of an *effective* free energy, though its application is debatable due to the undefined temperature in such mixtures [3-4]. Our study aims to delineate the steady state of these particle mixtures using simulations and theoretical analysis of the extremal properties of the free entropy functional [5].

[1] S. N. Weber, C. A. Weber, and E. Frey, Phys. Rev. Lett. 116, 058301 (2016).

[2] S. S. N. Chari, C. Dasgupta, and P. K. Maiti, Soft Matter 15, 7275-7285 (2019).

[3] C. A. Weber, D. Zwicker, F. Jülicher, and C. F. Lee, Rep. Prog. Phys. 82, 064601 (2019).

[4] E. Ilker and J.-F. Joanny, Phys. Rev. Res. 2, 023200 (2020).

[5] R. R. Netz, Phys. Rev. E 101, 022120 (2020).

Keywords: Nonequilibrium; Phase-separation; active matter; diffusion; entropy