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DY: Fachverband Dynamik und Statistische Physik

DY 36: Active Matter 3 - organized by Carsten Beta (Potsdam), Andreas Menzel (Magdeburg) and Holger Stark (Berlin) (joint session DY/BP)

DY 36.2: Talk

Wednesday, March 24, 2021, 09:20–09:40, DYb

Cooling by Heating in Inertial Active Brownian Particles — •Lukas Hecht and Benno Liebchen — Institut für Physik kondensierter Materie, Technische Universität Darmstadt, Hochschulstraße 8, D-64289 Darmstadt, Germany

The active Brownian particle (ABP) model is commonly used to model active matter consisting of particles which extract energy from their environment to generate directed motion. For both overdamped and inertial ABPs, motility-induced phase separation occurs in a certain parameter regime. Remarkably, inertial ABPs show a coexistence of different effective temperatures of the dilute and the dense phase whereas overdamped ABPs have a uniform effective temperature even in the phase-separated state [1].

The coexistence of different temperatures brings us to the cooling-by-heating idea: Increasing the self-propulsion speed locally could lead to a locally decreased temperature. We investigate the cooling-by-heating idea with numerical simulations of ABPs with translational and rotational inertia. Since a locally increased self-propulsion speed causes a decrease of the local particle density, detailed knowledge about the phase diagram is essential to determine appropriate parameters for which cooling by heating is possible. Therefore, we analyze the phase transition behavior of inertial ABPs and the corresponding phase diagram.

[1] S. Mandal, B. Liebchen, and H. Löwen, “Motility-Induced Temperature Difference in Coexisting Phases”, Phys. Rev. Lett. 123, 228001 (2019).