Disentangling collective coupling in vibrational polaritons with double quantum coherence spectroscopy

Area of Science:

• Chemistry
• Physics
• Spectroscopy

Background:

• Vibrational polaritons arise from strong coupling between molecular vibrations and optical cavity photon modes.
• Previous experiments show vibrational strong coupling can alter molecular properties and chemical reactivity.
• The precise mechanisms behind these modifications in molecular ensembles remain incompletely understood.

Purpose of the Study:

• To gain deeper insight into the complex many-body structure of vibrational polaritons.
• To investigate the mechanisms by which light-matter interactions influence molecular properties and reactivity.
• To explore spectral features beyond single-molecule cases.

Main Methods:

• Simulation of two-dimensional infrared spectra for molecular vibrational polaritons.
• Utilizing the double quantum coherence technique to probe hybrid light-matter states.
• Employing the cavity Born-Oppenheimer Hartree-Fock ansatz combined with full quantum dynamics simulations.

Main Results:

• Double quantum coherence effectively resolves the excitation of hybrid light-matter polaritons.
• Direct probing of anharmonicities in the resulting polaritonic states is achieved.
• The study accounts for self-polarization effects and electronic structure responses to cavity interactions.

Conclusions:

• The employed simulation methods provide a more comprehensive understanding of vibrational polaritons.
• The findings offer new perspectives on the influence of cavity quantum effects on molecular systems.
• This research advances the study of light-matter interactions in complex molecular ensembles.