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.
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14 October 2024
Research Article|
October 16 2024
Multimode vibrational coupling across the insulator-to-metal transition in 1T-TaS2 in THz cavities
Special Collection:
Polaritonics for Next Generation Materials
Giacomo Jarc
;
Giacomo Jarc
(Conceptualization, Data curation, Formal analysis, Investigation, Visualization, Writing – original draft)
1
Department of Physics, Università degli Studi di Trieste
, 34127 Trieste, Italy
2
Elettra Sincrotrone Trieste S.C.p.A.
, Basovizza, 34127 Trieste, Italy
3
Department of Physics, University of Erlangen-Nürnberg
, 91058 Erlangen, Germany
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Shahla Yasmin Mathengattil;
Shahla Yasmin Mathengattil
(Data curation, Formal analysis, Investigation)
1
Department of Physics, Università degli Studi di Trieste
, 34127 Trieste, Italy
2
Elettra Sincrotrone Trieste S.C.p.A.
, Basovizza, 34127 Trieste, Italy
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Angela Montanaro
;
Angela Montanaro
(Investigation, Writing – review & editing)
1
Department of Physics, Università degli Studi di Trieste
, 34127 Trieste, Italy
2
Elettra Sincrotrone Trieste S.C.p.A.
, Basovizza, 34127 Trieste, Italy
3
Department of Physics, University of Erlangen-Nürnberg
, 91058 Erlangen, Germany
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Enrico Maria Rigoni
;
Enrico Maria Rigoni
(Writing – review & editing)
1
Department of Physics, Università degli Studi di Trieste
, 34127 Trieste, Italy
2
Elettra Sincrotrone Trieste S.C.p.A.
, Basovizza, 34127 Trieste, Italy
3
Department of Physics, University of Erlangen-Nürnberg
, 91058 Erlangen, Germany
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Simone Dal Zilio
;
Simone Dal Zilio
(Investigation, Writing – review & editing)
4
CNR-IOM TASC Laboratory
, Trieste 34139, Italy
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Daniele Fausti
Daniele Fausti
a)
(Conceptualization, Funding acquisition, Methodology, Writing – review & editing)
1
Department of Physics, Università degli Studi di Trieste
, 34127 Trieste, Italy
2
Elettra Sincrotrone Trieste S.C.p.A.
, Basovizza, 34127 Trieste, Italy
3
Department of Physics, University of Erlangen-Nürnberg
, 91058 Erlangen, Germany
a)Author to whom correspondence should be addressed: daniele.fausti@fau.de
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a)Author to whom correspondence should be addressed: daniele.fausti@fau.de
J. Chem. Phys. 161, 154711 (2024)
Article history
Received:
July 31 2024
Accepted:
October 01 2024
Citation
Giacomo Jarc, Shahla Yasmin Mathengattil, Angela Montanaro, Enrico Maria Rigoni, Simone Dal Zilio, Daniele Fausti; Multimode vibrational coupling across the insulator-to-metal transition in 1T-TaS2 in THz cavities. J. Chem. Phys. 14 October 2024; 161 (15): 154711. https://doi.org/10.1063/5.0231533
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