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Ferroelectricity by Bose–Einstein condensation in a quantum magnet

Author

Listed:
  • S. Kimura

    (Institute for Materials Research, Tohoku University)

  • K. Kakihata

    (Institute for Materials Research, Tohoku University)

  • Y. Sawada

    (Institute for Materials Research, Tohoku University)

  • K. Watanabe

    (Institute for Materials Research, Tohoku University)

  • M. Matsumoto

    (Shizuoka University)

  • M. Hagiwara

    (Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University)

  • H. Tanaka

    (Tokyo Institute of Technology)

Abstract

The Bose–Einstein condensation is a fascinating phenomenon, which results from quantum statistics for identical particles with an integer spin. Surprising properties, such as superfluidity, vortex quantization or Josephson effect, appear owing to the macroscopic quantum coherence, which spontaneously develops in Bose–Einstein condensates. Realization of Bose–Einstein condensation is not restricted in fluids like liquid helium, a superconducting phase of paired electrons in a metal and laser-cooled dilute alkali atoms. Bosonic quasi-particles like exciton-polariton and magnon in solids-state systems can also undergo Bose–Einstein condensation in certain conditions. Here, we report that the quantum coherence in Bose–Einstein condensate of the magnon quasi particles yields spontaneous electric polarization in the quantum magnet TlCuCl3, leading to remarkable magnetoelectric effect. Very soft ferroelectricity is realized as a consequence of the O(2) symmetry breaking by magnon Bose–Einstein condensation. The finding of this ferroelectricity will open a new window to explore multi-functionality of quantum magnets.

Suggested Citation

  • S. Kimura & K. Kakihata & Y. Sawada & K. Watanabe & M. Matsumoto & M. Hagiwara & H. Tanaka, 2016. "Ferroelectricity by Bose–Einstein condensation in a quantum magnet," Nature Communications, Nature, vol. 7(1), pages 1-5, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12822
    DOI: 10.1038/ncomms12822
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    Cited by:

    1. Yoshito Watanabe & Atsushi Miyake & Masaki Gen & Yuta Mizukami & Kenichiro Hashimoto & Takasada Shibauchi & Akihiko Ikeda & Masashi Tokunaga & Takashi Kurumaji & Yusuke Tokunaga & Taka-hisa Arima, 2023. "Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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