Multimode vibrational coupling across the insulator-to-metal transition in 1T-TaS2 in THz cavities

Jarc G, Mathengattil SY, Montanaro A, Rigoni E, Dal Zilio S, Fausti D (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Book Volume: 161

Journal Issue: 15

DOI: 10.1063/5.0231533

Abstract

The use of optical cavities on resonance with material excitations allows controlling light-matter interaction in both the regimes of weak and strong coupling. We study here the multimode vibrational coupling of low energy phonons in the charge-density-wave material 1T-TaS2 across its insulator-to-metal phase transition. For this purpose, we embed 1T-TaS2 into THz Fabry-Pérot cryogenic cavities tunable in frequency within the spectral range of the vibrational modes of the insulating phase and track the linear response of the coupled phonons across the insulator-to-metal transition. In the low temperature dielectric state, we reveal the signatures of a multimode vibrational strong collective coupling. The observed polariton modes inherit character from all the vibrational resonances as a consequence of the cavity-mediated hybridization. We reveal that the vibrational strong collective coupling is suppressed across the insulator-to-metal transition as a consequence of the phonon-screening induced by the free charges. Our findings emphasize how the response of cavity-coupled vibrations can be modified by the presence of free charges, uncovering a new direction toward the tuning of coherent light-matter interaction in cavity-confined correlated materials.

Authors with CRIS profile

Involved external institutions

Università degli Studi di Trieste Italy (IT) Laboratorio Nazionale TASC Italy (IT)

How to cite

APA:

Jarc, G., Mathengattil, S.Y., Montanaro, A., Rigoni, E., Dal Zilio, S., & Fausti, D. (2024). Multimode vibrational coupling across the insulator-to-metal transition in 1T-TaS2 in THz cavities. Journal of Chemical Physics, 161(15). https://doi.org/10.1063/5.0231533

MLA:

Jarc, Giacomo, et al. "Multimode vibrational coupling across the insulator-to-metal transition in 1T-TaS2 in THz cavities." Journal of Chemical Physics 161.15 (2024).

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