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Active matter : stochastic single active particle engine and emergent behavior in many-particle systems
I will present results pertaining to two very different active matter systems. First, I will show how a nonreciprocal coupling between an active particle’s self-propulsion and position can be used to extract useful work from a single active particle maintained at constant temperature [1]. Second, I will discuss aspects of collective dynamics of persistent dense active fluids. I will review long-ranged velocity correlations in dense athermal active matter that appear even in systems without explicit velocity aligning interactions [2]. The range of these correlations in active fluids is determined by the combination of the persistence time and the virial bulk modulus that originates from repulsive interparticle interactions. Finally, I will show that for large persistence times, many properties of dense active fluids depend on the strength of the self-propulsion force as power laws [3].
[1] G. Szamel, Phys. Rev. E 102, 042605 (2020).
[2] G. Szamel and E. Flenner, EPL 133, 60002 (2021).
[3] G. Szamel and E. Flenner, arXiv:2307.01298.