Investigating Molecular Exciton Polaritons Using Ab Initio Cavity Quantum Electrodynamics

Area of Science:

• Quantum chemistry
• Quantum electrodynamics (QED)
• Photon-matter hybrid systems

Background:

• Coupling molecules to optical cavities forms polariton states, crucial for light-matter interactions.
• Accurate simulation of these hybrid states is essential for designing advanced materials.

Purpose of the Study:

• To develop and validate an *ab initio* simulation framework for molecular polaritons.
• To investigate the accuracy of the "parametrized QED" approach for predicting molecular polariton properties.

Main Methods:

• Combining electronic structure theory (time-dependent density functional theory) with quantum electrodynamics (QED).
• Utilizing a parametrized QED approach that combines adiabatic electronic states with the Fock basis.
• Computing eigenstates of the QED Hamiltonian for molecule-cavity systems.

Main Results:

• The parametrized QED method accurately predicts potential energy surfaces for ground and excited states.
• Achieved accuracy comparable to QED coupled cluster benchmark calculations.
• Demonstrated applications in light-harvesting and light-emitting materials.

Conclusions:

• The developed *ab initio* simulation framework enables precise modeling of molecular polaritons.
• This approach offers powerful tools for direct simulation of exciton polaritons in hybrid systems.
• Anticipated to advance the design and understanding of novel photonic materials.