1. Ultrastrong coupling between THz phonons and photons caused by an enhanced vacuum electric field
- Author
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Yasuko Iwasaki, Tomoya Nakamura, Hideki Hirori, Atsushi Wakamiya, Fumiya Sekiguchi, Ai Shimazaki, Yoshihiko Kanemitsu, and Zhenya Zhang
- Subjects
Physics ,Coupling ,Photon ,Condensed matter physics ,Phonon ,Terahertz radiation ,Finite-difference time-domain method ,Cavity quantum electrodynamics ,Physics::Optics ,Split-ring resonators ,Perovskite ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Split-ring resonator ,Condensed Matter::Materials Science ,Semiconductors ,Terahertz time-domain spectroscopy ,Condensed Matter::Superconductivity ,Electric field ,Phonon polariton ,Light-matter interaction ,Optical phonons ,Condensed Matter::Strongly Correlated Electrons - 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., 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.
- Published
- 2021