Ultrastrong magnon–magnon coupling dominated by antiresonant interactions

  title={Ultrastrong magnon–magnon coupling dominated by antiresonant interactions},
  author={Takuma Makihara and Kenji Hayashida and G Timothy Noe Ii and Xinwei Li and Nicolas Marquez Peraca and Xiaoxuan Ma and Zuanming Jin and Wei Ren and Guohong Ma and Ikufumi Katayama and Jun Takeda and Hiroyuki Nojiri and Dmitry Turchinovich and Shixun Cao and Motoaki Bamba and Junichiro Kono},
  journal={Nature Communications},
Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics systems with ultrastrong light-matter interactions. Their ground states are predicted to be vacuum squeezed states with suppressed quantum fluctuations owing to antiresonant terms in the Hamiltonian. However, such predictions have not been realized because antiresonant interactions are typically negligible compared to resonant interactions in light-matter systems. Here we report an unusual, ultrastrongly coupled… 

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