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DY: Fachverband Dynamik und Statistische Physik

DY 32: Focus Session: Physics of Fluctuating Paths (joint session DY/CPP)

DY 32.6: Vortrag

Mittwoch, 29. März 2023, 16:15–16:30, ZEU 160

Entropons as vibrational excitations in active solids — •Lorenzo Caprini¹, Umberto Marini Bettolo Marconi², Andrea Puglisi³, and Hartmut Löwen¹ — ¹Heinrich-Heine-Universität Düsseldorf — ²Scuola di Scienze e Tecnologie, University of Camerino — ³Istituto dei Sistemi Complessi, CNR

We study the vibrational properties of non-equilibrium active crystals, i.e. solids formed by active particles, that are intrinsically out of equilibrium and governed by entropy production. As known in solid-state physics, equilibrium crystals are characterized by basic collective excitations with thermal origins that are named phonons. In this talk, I will show that active crystals are described by additional vibrational excitations that we called `entropons' because each of them represents a mode of spectral entropy production. Entropons coexist with phonons and dominate over them for large activity, i.e. when the solid is far from equilibrium, while they vanish in equilibrium conditions. Their existence can be verified in experiments on dense self-propelled colloidal Janus particles and granular active matter, as well as in living systems such as dense cell monolayers.