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research article

Dynamics of topological defects in the noisy Kuramoto model in two dimensions

Rouzaire, Ylann
•
Levis, Demian
August 31, 2022
Frontiers In Physics

We consider the two-dimensional (2D) noisy Kuramoto model of synchronization with short-range coupling and a Gaussian distribution of intrinsic frequencies, and investigate its ordering dynamics following a quench. We consider both underdamped (inertial) and over-damped dynamics, and show that the long-term properties of this intrinsically out-of-equilibrium system do not depend on the inertia of individual oscillators. The model does not exhibit any phase transition as its correlation length remains finite, scaling as the inverse of the standard deviation of the distribution of intrinsic frequencies. The quench dynamics proceeds via domain growth, with a characteristic length that initially follows the growth law of the 2D XY model, although is not given by the mean separation between defects. Topological defects are generically free, breaking the Berezinskii-Kosterlitz-Thouless scenario of the 2D XY model. Vortices perform a random walk reminiscent of the self-avoiding random walk, advected by the dynamic network of boundaries between synchronised domains; featuring long-time super-diffusion, with the anomalous exponent alpha = 3/2.

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Type
research article
DOI
10.3389/fphy.2022.976515
Web of Science ID

WOS:000892181200001

Author(s)
Rouzaire, Ylann
Levis, Demian
Date Issued

2022-08-31

Published in
Frontiers In Physics
Volume

10

Article Number

976515

Subjects

Physics, Multidisciplinary

•

Physics

•

topological defects

•

synchronisation

•

active matter

•

langevin dynamics

•

anomalous diffusion

•

out-of-equilibrium systems

•

nonequilibrium critical-dynamics

•

2-dimensional xy model

•

synchronization

•

temperature

•

vicsek

•

walks

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

Available on Infoscience
December 19, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/193317
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