Dresden 2020 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 37: Active Matter IV (joint session DY/BP/CPP)

DY 37.6: Vortrag

Mittwoch, 18. März 2020, 11:30–11:45, ZEU 160

Interaction of Active Crystallites within the Active Phase-Field-Crystal Model — •Lukas Ophaus1, Johannes Kirchner2, and Uwe Thiele1,21Center for Nonlinear Science, Münster, Germany — 2Institut für Theoretische Physik, Münster, Germany

We use the active phase-field-crystal (PFC) model, developed by Menzel and Löwen as a model for crystallizing self-propelled particles [1], to study the interaction of traveling crystalline patches. Within the active PFC model, these localized states exist besides periodic states, i.e., spatially extended crystals [2]. Due to the activity, crystalline states undergo a drift instability and start to travel while keeping their spatial structure. Using results for the parameter ranges where the individual states exist, we explore how two and more traveling localized states interact by performing numerical collision experiments. We show that a critical minimal free path is necessary to preserve the number of colliding localized states and that the active PFC model fails to exhibit dynamical clustering and motility induced phase separation.

[1] A.M. Menzel and H. Löwen, Phys. Rev. Lett. 110, 055702 (2013)

[2] L. Ophaus, S.V. Gurevich and U. Thiele, Phys. Rev. E 98, 022608 (2018)

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