Chimera States in Networks of Locally and Non-locally Coupled SQUIDs

Johanne Hizanidis, Nikos Lazarides, Giorgos P. Tsironis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Planar and linear arrays of SQUIDs (superconducting quantum interference devices) operate as non-linear magnetic metamaterials in microwaves. Such SQUID metamaterials are paradigmatic systems that serve as a test-bed for simulating several non-linear dynamics phenomena. SQUIDs are highly non-linear oscillators which are coupled together through magnetic dipole-dipole forces due to their mutual inductance; that coupling falls-off approximately as the inverse cube of their distance, i.e., it is non-local. However, it can be approximated by a local (nearest-neighbor) coupling which in many cases suffices for capturing the essentials of the dynamics of SQUID metamaterials. For either type of coupling, it is numerically demonstrated that chimera states as well as other spatially non-uniform states can be generated in SQUID metamaterials under time-dependent applied magnetic flux for appropriately chosen initial conditions. The mechanism for the emergence of these states is discussed in terms of the multistability property of the individual SQUIDs around their resonance frequency and the attractor crowding effect in systems of coupled non-linear oscillators. Interestingly, controlled generation of chimera states in SQUID metamaterials can be achieved in the presence of a constant (dc) flux gradient with the SQUID metamaterial initially at rest.

Original languageEnglish
Article number33
JournalFrontiers in Applied Mathematics and Statistics
Volume5
DOIs
Publication statusPublished - Jul 12 2019

Keywords

  • attractor crowding
  • chimera states
  • coupled non-linear oscillators
  • magnetic metamaterials
  • snaking resonance curve
  • SQUID
  • SQUID metamaterials
  • synchronization-desynchronization transition

ASJC Scopus subject areas

  • Applied Mathematics
  • Statistics and Probability

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