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Phase-shift inversion in oscillator systems with periodically switching couplings
Umeå University, Faculty of Science and Technology, Department of Physics. (IceLab)
Umeå University, Faculty of Science and Technology, Department of Physics. (IceLab)
Department of Applied Physics, Hanyang University, Korea.
Umeå University, Faculty of Science and Technology, Department of Physics. (IceLab)ORCID iD: 0000-0003-2156-1096
2012 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 85, no 2, 027202- p.Article in journal (Refereed) Published
Abstract [en]

A system's response to external periodic changes can provide crucial information about its dynamical properties. We investigate the synchronization transition, an archetypical example of a dynamic phase transition, in the framework of such a temporal response. The Kuramoto model under periodically switching interactions has the same type of phase transition as the original mean-field model. Furthermore, we see that the signature of the synchronization transition appears in the relative delay of the order parameter with respect to the phase of oscillating interactions as well. Specifically, the phase shift becomes significantly larger as the system gets closer to the phase transition, so that the order parameter at the minimum interaction density can even be larger than that at the maximum interaction density, counterintuitively. We argue that this phase-shift inversion is caused by the diverging relaxation time, in a similar way to the resonance near the critical point in the kinetic Ising model. Our result, based on exhaustive simulations on globally coupled systems as well as scale-free networks, shows that an oscillator system's phase transition can be manifested in the temporal response to the topological dynamics of the underlying connection structure.

Place, publisher, year, edition, pages
American Physical Society , 2012. Vol. 85, no 2, 027202- p.
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URN: urn:nbn:se:umu:diva-52612DOI: 10.1103/PhysRevE.85.027202OAI: oai:DiVA.org:umu-52612DiVA: diva2:506126
Available from: 2012-02-29 Created: 2012-02-27 Last updated: 2017-12-07Bibliographically approved

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