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DY: Fachverband Dynamik und Statistische Physik

DY 52: Poster: Active Matter, Microswimmer, Microfluidics

DY 52.10: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster B2

Brownian molecules formed by delayed harmonic interactions — •Daniel Geiß and Viktor Holubec — Institut für theoretische Physik, Uni Leipzig, Deutschland

A time-delayed response of individual living organisms to information exchange within groups or swarms leads to the formation of complicated collective behavior. A recent experimental setup where Brownian particles interact via time-delayed forces aims to mimic this behavior [1]. We study a system of N Brownian particles interacting via a harmonic, time-delayed potential. For N < 4, we model the problem analytically by linear stochastic delay differential equations, and for N > 3 we use Brownian dynamics simulations. The particles form molecular-like structures which become increasingly unstable with the number of particles and the length of the delay. We evaluate the entropy fluxes in the system and develop an appropriate time-dependent transition state theory to characterize transitions between different isomers of the molecules.

[1] U. Khadka, V. Holubec, H. Yang, and F. Cichos: Nat. Commun. 9, 3864 (2018)