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  • Letter
  • Open Access

Ultrastrong coupling between THz phonons and photons caused by an enhanced vacuum electric field

Zhenya Zhang, Hideki Hirori*, Fumiya Sekiguchi, Ai Shimazaki, Yasuko Iwasaki, Tomoya Nakamura, Atsushi Wakamiya, and Yoshihiko Kanemitsu†

  • Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan

  • *hirori@scl.kyoto-u.ac.jp
  • †kanemitu@scl.kyoto-u.ac.jp
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Phys. Rev. Research 3, L032021 – Published 27 July, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L032021

Abstract

Ultrastrong coupling (USC) between phonons and vacuum photons can result in fascinating quantum phenomena, though it is difficult to achieve due to the small dipole moments of phonons in solids. Here, we investigate the vacuum Rabi splitting by coupling phonons in perovskite CH3NH3PbI3 films with photons in split ring resonators. As the gap size of the resonator decreases, the coupling strength η increases due to the enhanced vacuum field in the gap, reaching the USC regime (η∼0.24) at a gap size of 100 nm. Our results show that nanoresonators are an excellent platform for studies of vacuum-dressed phonon properties.

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Phys. Rev. Research 3, L032021– Published 27 July, 2021
  • Received 14 May 2021
  • Accepted 8 July 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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