Fig. 4: Longitudinal acoustic phonon-assisted excitation and spectral diffusion.
From: High-purity and stable single-photon emission in bilayer WSe2 via phonon-assisted excitation
a Coarse PLE spectrum of the quantum emitter, showing two absorption maxima centered at detuning Δλ = −1.7 nm and Δλ = −0.3 nm, respectively. b Power dependence of the peak intensity evaluated at a detuning Δλ = −1.4 nm. High-resolution PL spectra at time 1 s (c) and (d) and their time evolution (e) and (f) for above-band excitation and phonon-assisted excitation, respectively. g, h show the statistical analysis of the central wavelength of the ZPL as extracted from the fitting of each line in the map. The red curves are Gaussian fittings of the obtained distributions. The mean value and the standard deviation in (g) are μZPL = 800.49 nm and σZPL = 0.0232 nm, respectively. At the same time, their values for (h) are μZPL = 800.62 nm and σZPL = 0.0129 nm.
