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Title: Ultrastrong coupling between THz phonons and photons caused by an enhanced vacuum electric field
Authors: Zhang, Zhenya
Hirori, Hideki  kyouindb  KAKEN_id  orcid (unconfirmed)
Sekiguchi, Fumiya
Shimazaki, Ai
Iwasaki, Yasuko
Nakamura, Tomoya  kyouindb  KAKEN_id
Wakamiya, Atsushi  kyouindb  KAKEN_id  orcid (unconfirmed)
Kanemitsu, Yoshihiko  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 章, 振亜
廣理, 英基
関口, 文哉
嶋崎, 愛
岩﨑, 保子
中村, 智也
若宮, 淳志
金光, 義彦
Keywords: Cavity quantum electrodynamics
Light-matter interaction
Optical phonons
Phonon polariton
Split-ring resonators
Finite-difference time-domain method
Terahertz time-domain spectroscopy
Issue Date: Jul-2021
Publisher: American Physical Society (APS)
Journal title: Physical Review Research
Volume: 3
Issue: 3
Thesis number: 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.
Description: テラヘルツ周波数帯の真空量子揺らぎと格子振動の超強結合状態の実現 --量子光を駆動力とする新規物性制御への挑戦--. 京都大学プレスリリース. 2021-07-30.
Rights: 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.
DOI(Published Version): 10.1103/physrevresearch.3.l032021
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