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DY: Fachverband Dynamik und Statistische Physik

DY 22: Poster: Statistical Physics

DY 22.14: Poster

Mittwoch, 19. März 2025, 10:00–12:00, P3

Criticality in non-reciprocal spin modells — •Max Häßler and Martin Weigel — TU Chemnitz, Chemnitz, Deutschland

Equilibrium statistical physics is based on symmetric, Hamiltonian interactions fulfilling Newton*s Third Law. On the other hand, active matter like bacteria or other self-propelled particles such as bird flocks violates time-reversal symmetry and is often characterized by non-reciprocal interactions. Simple models are of interest for exploring fundamental features of such systems. We examine classical spin systems including the Ising model with non-reciprocal interactions, using Monte Carlo simulations to study criticality in such models. For several systems we determine critical exponents and compare the observed universality classes to those of the corresponding reciprocal, equilibrium models.

Keywords: Ising Model; Non-reciprocal Interactions; Critical behavior; Non-equilibrium steady states