Supplementary Online Material

See the supplementary material for the details of (1) Matrix representation of the molecular dipole moment for different models; (2) Analysis of the energy level of several polaritonic states and Rabi splitting; (3) Reaction dynamics of a single molecule in a lossless cavity; (4) Analysis of the reaction dynamics for Model II inside the cavity with a stronger lightmatter interaction η c = 0.005; (5) The photon distribution of the cavity mode; (6) The temperature effect on the rate modification for Model I inside the cavity; (7) Comparison of the reaction rates over a range of η c between a monomer and a homodimer inside the cavity; (8) Comparison of the reaction rates between a monomer and a homodimer inside the cavity with the same Rabi splitting.