Symmetry-Controlled Ultrastrong Phonon-Photon Coupling in a Terahertz Cavity

• URL: http://arxiv.org/abs/2511.16285v1
• Date: Thu, 20 Nov 2025 12:06:33 GMT
• Title: Symmetry-Controlled Ultrastrong Phonon-Photon Coupling in a Terahertz Cavity
• Authors: Dasom Kim, Maxime Dherbécourt, Sae R. Endo, Geon Lee, Ayush Agrawal, Sunghwan Kim, Wen-Hua Wu, Aditya D. Mohite, Minah Seo, David Hagenmüller, Junichiro Kono,
• Abstract summary: We use a symmetry-changing structural phase transition in lead halide perovskites to reversibly tune the phonon-photon coupling strength.<n> Terahertz time-domain spectroscopy of MAPbI3 embedded in nanoslot cavities reveals three polariton branches above the critical temperature Tc = 162.5 K.<n>Results demonstrate symmetry-controlled tuning of ultrastrong coupling via phonon engineering in optical cavities.
• Score: 9.834840560116257
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Optical cavities provide a powerful means to engineer light-matter hybrid states by coupling confined electromagnetic fields with matter excitations. Achieving in situ control of the coupling strength is essential for investigating how such hybridization evolves with the coupling strength. In this work, we use a symmetry-changing structural phase transition in lead halide perovskites to reversibly tune the phonon-photon coupling strength, leveraging the fact that their phonon frequencies and oscillator strengths are dictated by lattice symmetry. Terahertz time-domain spectroscopy of MAPbI3 embedded in nanoslot cavities reveals three polariton branches above the critical temperature Tc = 162.5 K, and the emergence of an additional branch below Tc, activated by a new phonon mode in the low-temperature phase. The full dispersion is accurately reproduced using a multimode Hopfield model, confirming that all normalized coupling strengths remain in the ultrastrong coupling regime. These results demonstrate symmetry-controlled tuning of ultrastrong coupling via phonon engineering in optical cavities.

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