Figure 6.

Complex plasmon-exciton dynamics in a bowtie-QD system. (a–c) Simulated scattering (green) and emission (red) spectra of a plasmonic cavity coupled to a QD described by a two-level bright electronic system. Here, the intrinsic decay rate of the plasmon is 400 meV, and that of the bright exciton is 0.1 μeV. The pure dephasing of the bright exciton is 130 meV. The exciton–plasmon coulpling is 50, 100, and 200 meV in a, b, and c, respectively. (d) Schematic level diagram describing the extended Jaynes–Cummings model. The plasmonic cavity is depicted on the left and the QD on the right. The QD is described as a three-level electronic system containing a ground state, |g⟩, a bright excitonic level, |e_B⟩, and a dark excitonic level, |e_D⟩. The bright (dark) excitonic transition occurs at energy ω_B (ω_D). Plasmon–exciton coupling is described with rates g_B and g_D for coupling of the bright and dark exciton, respectively. (e) Emission (red), scattering (green), and absorption (blue) spectra calculated numerically with parameters shown in Table 1 in ref (3). The dashed line marks the energy of the dark exciton, ℏω_D. (f) Simulated g²(t) features a two-component decay. Inset shows a zoom of the fast (femtosecond) decay of system excitations that is not resolved on the nanosecond time scale. (d–f) Reproduced with permission from ref (3). Copyright 2021 Springer Nature under a Creative Commons CC BY License.