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Ultrastrong magnon–magnon coupling dominated by antiresonant interactions

Author

Listed:
  • Takuma Makihara

    (Rice University)

  • Kenji Hayashida

    (Rice University
    Hokkaido University)

  • G. Timothy Noe II

    (Rice University)

  • Xinwei Li

    (Rice University)

  • Nicolas Marquez Peraca

    (Rice University)

  • Xiaoxuan Ma

    (International Center of Quantum and Molecular Structures and Materials Genome Institute, Shanghai University)

  • Zuanming Jin

    (University of Shanghai for Science and Technology)

  • Wei Ren

    (International Center of Quantum and Molecular Structures and Materials Genome Institute, Shanghai University)

  • Guohong Ma

    (International Center of Quantum and Molecular Structures and Materials Genome Institute, Shanghai University)

  • Ikufumi Katayama

    (Yokohama National University)

  • Jun Takeda

    (Yokohama National University)

  • Hiroyuki Nojiri

    (Tohoku University)

  • Dmitry Turchinovich

    (Universität Bielefeld)

  • Shixun Cao

    (International Center of Quantum and Molecular Structures and Materials Genome Institute, Shanghai University)

  • Motoaki Bamba

    (Kyoto University
    PRESTO, Japan Science and Technology Agency
    Kyoto University)

  • Junichiro Kono

    (Rice University
    Rice University
    Rice University)

Abstract

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 matter-matter system of magnons that is analytically described by a unique Hamiltonian in which the relative importance of resonant and antiresonant interactions can be easily tuned and the latter can be made vastly dominant. We found a regime where vacuum Bloch-Siegert shifts, the hallmark of antiresonant interactions, greatly exceed analogous frequency shifts from resonant interactions. Further, we theoretically explored the system’s ground state and calculated up to 5.9 dB of quantum fluctuation suppression. These observations demonstrate that magnonic systems provide an ideal platform for exploring exotic quantum vacuum phenomena predicted in ultrastrongly coupled light-matter systems.

Suggested Citation

  • Takuma Makihara & Kenji Hayashida & G. Timothy Noe II & Xinwei Li & Nicolas Marquez Peraca & Xiaoxuan Ma & Zuanming Jin & Wei Ren & Guohong Ma & Ikufumi Katayama & Jun Takeda & Hiroyuki Nojiri & Dmitr, 2021. "Ultrastrong magnon–magnon coupling dominated by antiresonant interactions," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23159-z
    DOI: 10.1038/s41467-021-23159-z
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    Cited by:

    1. Yuqiang Wang & Yu Zhang & Chaozhong Li & Jinwu Wei & Bin He & Hongjun Xu & Jihao Xia & Xuming Luo & Jiahui Li & Jing Dong & Wenqing He & Zhengren Yan & Wenlong Yang & Fusheng Ma & Guozhi Chai & Peng Y, 2024. "Ultrastrong to nearly deep-strong magnon-magnon coupling with a high degree of freedom in synthetic antiferromagnets," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. Byung Cheol Park & Howon Lee & Sang Hyup Oh & Hyun Jun Shin & Young Jai Choi & Taewoo Ha, 2024. "Re-order parameter of interacting thermodynamic magnets," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    3. Nicolas Couture & Wei Cui & Markus Lippl & Rachel Ostic & Défi Junior Jubgang Fandio & Eeswar Kumar Yalavarthi & Aswin Vishnuradhan & Angela Gamouras & Nicolas Y. Joly & Jean-Michel Ménard, 2023. "Single-pulse terahertz spectroscopy monitoring sub-millisecond time dynamics at a rate of 50 kHz," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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