Cooperative exchange coupling of rare-earth spins with a vacuum magnon field in ErFeO<sub>3</sub>

ORAL

Abstract

Dicke cooperativity is a many-body effect in quantum optics describing the process of N oscillators in a photonic cavity developing macroscopic coherence amongst themselves by interacting with a single light field, while exhibiting a N1/2 enhancement of the light-matter coupling rate. Here, we have discovered that cooperatively enhanced coupling similar to this canonical light-matter interaction effect occurs in a magnetic solid in the form of matter-matter interaction. We studied an ErFeO3 single crystal with terahertz magnetospectroscopy at low temperatures and high magnetic fields, and discovered that the exchange coupling of the paramagnetic Er3+ ions with a Fe3+ magnon field within the crystal quantitatively follows the scaling behavior expected by the Dicke cooperativity effect. This scaling behavior also enables quantitative determination of the Er3+-Fe3+ exchange coupling coefficients. Our finding provides a novel route for understanding, controlling, or predicting new phases of condensed matter using concepts and tools available in quantum optics.

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Presenters

  • Xinwei Li

    • Department of Electrical and Computer Engineering, Rice University
    • Electrical Engineering, Rice University

Authors

  • Xinwei Li

    • Department of Electrical and Computer Engineering, Rice University
    • Electrical Engineering, Rice University

  • Motoaki Bamba

    • Department of Materials Engineering Science, Osaka University

  • Ning Yuan

    • Department of Physics, Shanghai University

  • Qi Zhang

    • Argonne National Laboratory
    • Electrical Engineering, Rice University

  • Yage Zhao

    • Department of Physics, Rice University

  • Maolin Xiang

    • Department of Physics, Shanghai University

  • Kai Xu

    • Department of Physics, Shanghai University

  • Zuanming Jin

    • Department of Physics, Shanghai University

  • Wei Ren

    • Department of Physics, Shanghai University
    • Shanghai University
    • Physics Department, Shanghai University

  • Guohong Ma

    • Department of Physics, Shanghai University

  • Shixun Cao

    • Department of Physics, Shanghai University

  • Dmitry Turchinovich

    • Fakultät für Physik, Universität Duisburg-Essen

  • Junichiro Kono

    • Department of Electrical and Computer Engineering, Rice University
    • Electrical Engineering, Rice University