Excitation density controlled regimes of collective light--matter dynamics

Theoretical descriptions of collective light--matter dynamics often rely on the mean-field (MF) or single-excitation (SE) approximations, yet the parameter regimes where they apply are rarely clearly delineated. Here we show that representative limiting regimes are characterized by two independent parameters: the number of molecules N and the excitation number N_{rm exc}. In the Tavis--Cummings model, when Ngg 1 and the excitation density N_{rm exc} / N → 0, MF and SE descriptions agree and yield linear collective dynamics, showing harmonic Rabi oscillations. At finite excitation density $N_{rm exc} / N sim mathcal{O}(1), the large-\(N\) limit remains accurately described by MF dynamics but becomes nonlinear inN_{\rm exc} / N, manifested by a Duffing equation for the cavity amplitude with anharmonic Rabi frequency. We further show that cluster expansion systematically restores finite-N$ correlations beyond MF. When local vibronic interactions are included, the same linear collective limit is reached by both approximations, with SE reaching it through polaron decoupling and MF through linearization. This two-parameter regime map clarifies the limits in which different theoretical descriptions provide controlled descriptions of collective light--matter dynamics.