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Chaos and Chimera in Hysteretic RF SQUID Metamaterials

ORAL

Abstract

RF SQUIDs have been established as viable building blocks for microwave frequency metamaterials [1,2]. The RF SQUID resonance is tunable under applied DC flux, with upper-frequency range scaling as √(1+βrf). Our previous design restricted the parameter βrf below unity to avoid hysteresis, thus limited the resonance range. We have built new arrays of RF SQUID meta-atoms in the hysteretic regime to explore their interesting properties with the ultimate goal of extending the resonance frequency tunability. In particular, a strong and positive out-of-plane coupling among the SQUIDs is achieved through an alternating-overlapping-loop geometry, potentially mitigating the hysteresis from high-βrf SQUID meta-atoms. Much theoretical work has predicted chaotic dynamics and chimera states in such systems. Observations of the above nonlinear phenomena in microwave transmission measurements and laser scanning microscopy [3] will be reported.

[1] Phys. Rev. X, 3, 041029 (2013) https://doi.org/10.1103/PhysRevX.3.041029
[2] Phys. Rev. X, 5, 041045 (2015) https://doi.org/10.1103/PhysRevX.5.041045
[3] Appl. Phys. Lett. 114, 082601 (2019) https://doi.org/10.1063/1.5064658

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Presenters

  • Jingnan Cai

    Physics Department, University of Maryland, College Park, University of Maryland, College Park

Authors

  • Jingnan Cai

    Physics Department, University of Maryland, College Park, University of Maryland, College Park

  • Steven Anlage

    University of Maryland, College Park, Department of Physics and Department of Electrical and Computer Engineering, University of Maryland, College Park, Physics Department, University of Maryland, College Park, Center for Quantum Materials, University of Maryland