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DY: Fachverband Dynamik und Statistische Physik
DY 23: Active Matter 2 - organized by Carsten Beta (Potsdam), Andreas Menzel (Magdeburg) and Holger Stark (Berlin) (joint session DY/BP/CPP)
DY 23.6: Talk
Tuesday, March 23, 2021, 12:40–13:00, DYa
Magnetic microswimmers exhibit Bose-Einstein-like condensation — Fanlong Meng1, Daiki Matsunaga2, •Benoît Mahault3, and Ramin Golestanian3 — 1CAS Key Laboratory for Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences — 2Graduate School of Engineering Science, Osaka University — 3Max Planck Institute for Dynamics and Self-Organization
We study an active matter system comprised of magnetic microswimmers confined in a microfluidic channel and show that it exhibits a new type of self-organized behavior. Combining analytical techniques and Brownian dynamics simulations, we demonstrate how the interplay of non-equilibrium activity, external driving, and magnetic interactions leads to the condensation of swimmers at the center of the channel via a non-equilibrium phase transition that is formally akin to Bose-Einstein condensation. We find that the effective dynamics of the microswimmers can be mapped onto a diffusivity-edge problem, and use the mapping to build a generalized thermodynamic framework, which is verified by a parameter-free comparison with our simulations. Our work reveals how driven active matter has the potential to generate exotic classical non-equilibrium phases of matter with traits that are analogous to those observed in quantum systems.