Decay dynamics in a strongly driven atom-molecule coupled system

摘要: Within the framework of master equation, we study decay dynamics an atom-molecule system strongly coupled by two photoassociation lasers. Summing over infinite number electromagnetic vacuum modes that are to laser-dressed system, obtain integro-differential equation for system's reduced density matrix. The is numerically solved describe in presence decay. In particular, discuss correlated spontaneous emission from a pair electronically excited diatomic ro-vibrational states due their laser induced coupling ground continuum atomic scattering states. This allows us calculate time-dependence emitted radiation intensity. It exhibits quantum beats coherent dynamics. phase difference between driving fields found significantly affect and beats. Our results demonstrate possibility control molecular decoherence them changing relative intensity We further show that, if ground-state has shape resonance at low energy, then distinctive time scales oscillations strong regime. One originates energy gap while other scale corresponds collision which free-bound Franck-Condon overlap resonantly peaked resonance.