BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 12: Posters DY - Fluid Physics, Active Matter, Complex Fluids, Soft Matter and Glasses (joint session DY/BP)
DY 12.7: Poster
Montag, 22. März 2021, 14:00–16:30, DYp
Active mobile oscillators: Density fluctuations and phase ordering — Astik Haldar1, •Swarnajit Chatterjee2, Apurba Sarkar3, Raja Paul3, and Abhik Basu1 — 1Saha Institute of Nuclear Physics, Kolkata, India — 2Center for Biophysics & Department for Theoretical Physics, Saarland University, Saarbrücken, Germany — 3Indian Association for the Cultivation Of Science, Kolkata, India
We consider the collective motion of nearly phase-ordered active oscillators on a substrate. The dynamics include activity-induced couplings between the local phase with the concentration of the mobile oscillators on the interface. We show that such a system can be stable over a wide range of model parameters. When stable, the system can also show a variety of orders. In different regions of the phase space, the system can show phase ordering that is stronger than the conventional quasi long-range order (QLRO) together with hyperuniform number fluctuations, or phase ordering weaker than QLRO together with giant number fluctuations, or even QLRO with uniform density fluctuations. In other parameter regimes, the system becomes unstable with the eventual loss of any phase ordering beyond a finite (small) system size. We have also constructed an appropriate agent-based lattice-gas model. Numerical simulations of this model corroborate the analytical predictions and validate the results on the phase fluctuations.