論文

査読有り 筆頭著者 責任著者 本文へのリンクあり 国際共著 国際誌
2022年1月10日

Magnonic superradiant phase transition

Communications Physics
  • Motoaki Bamba
  • ,
  • Xinwei Li
  • ,
  • Nicolas Marquez Peraca
  • ,
  • Junichiro Kono

5
開始ページ
3
終了ページ
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s42005-021-00785-z
出版者・発行元
Springer Nature

In the superradiant phase transition (SRPT), coherent light and matter fields are expected to appear spontaneously in a coupled light–matter system in thermal equilibrium. However, such an equilibrium SRPT is forbidden in the case of charge-based light–matter coupling, known as no-go theorems. Here, we show that the low-temperature phase transition of ErFeO3 at a critical temperature of approximately 4 K is an equilibrium SRPT achieved through coupling between Fe3+ magnons and Er3+ spins. By verifying the efficacy of our spin model using realistic parameters evaluated via terahertz magnetospectroscopy and magnetization experiments, we demonstrate that the cooperative, ultrastrong magnon–spin coupling causes the phase transition. In contrast to prior studies on laser-driven non-equilibrium SRPTs in atomic systems, the magnonic SRPT in ErFeO3 occurs in thermal equilibrium in accordance with the originally envisioned SRPT, thereby yielding a unique ground state of a hybrid system in the ultrastrong coupling regime.

リンク情報
DOI
https://doi.org/10.1038/s42005-021-00785-z 本文へのリンクあり
arXiv
http://arxiv.org/abs/arXiv:2007.13263
共同研究・競争的資金等の研究課題
量子状態の制御と保護を両立させる相転移環境
URL
http://arxiv.org/abs/2007.13263 本文へのリンクあり
ID情報
  • DOI : 10.1038/s42005-021-00785-z
  • arXiv ID : arXiv:2007.13263
  • 共同研究・競争的資金等の研究課題の業績ID : 11782982

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