Tuning of Strong Nonlinearity in rf SQUID Meta-Atoms

  title={Tuning of Strong Nonlinearity in rf SQUID Meta-Atoms},
  author={Ethan Zack and Daimeng Zhang and Melissa Trepanier and Jingnan Cai and Tamin Tai and Nick Lazarides and Johanne Hizanidis and Steven M. Anlage Quantum Materials Center and Dep. of Physics and University of Maryland and College Park and USA. and University of Crete and Herakleio and Greece.},
Strong nonlinearity of a self-resonant radio frequency superconducting quantum interference device (rf-SQUID) meta-atom is explored via intermodulation (IM) measurements. Previous work in zero dc magnetic flux showed a sharp onset of IM response as the frequency sweeps through the resonance. A second onset at higher frequency was also observed, creating a prominent gap in the IM response. By extending those measurements to nonzero dc flux, new dynamics are revealed, including: dc flux… 

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