Quantum dynamics of a plasmonic metamolecule with a time-dependent driving

We simulate the dynamics of a quantum dot coupled to the single resonating mode of a metal nanoparticle. Systems like this are known as metamolecules. In this study, we consider a time-dependent driving field acting onto the metamolecule. We use the Heisenberg equations of motion for the entire system, while representing the resonating mode in Wigner phase space. A time-dependent basis is adopted for the quantum dot. We integrate the dynamics of the metamolecule for a range of coupling strengths between the quantum dot and the driving field, while restricting the coupling between the quantum dot and the resonant mode to weak values. By monitoring the average of the time variation in the energy of the metamolecule model, as well as the coherence and the population difference in the quantum dot, we observe distinct nonlinear behavior in the case of strong coupling to the driving field.