Fig. 2: Photoluminescence spectra for different excitation wavelengths.
From: Deterministic and highly indistinguishable single photons in the telecom C-band
QD emission spectra shown for (a) above-band-gap excitation, (b) LA-phonon-assisted excitation, (c) resonance #1 (λpump = 1404.2 nm) and (d) resonance #2 (λpump = 1498.2 nm). Here, X denotes the neutral exciton, X+/− the charged exciton and XX the biexciton transition (see ref. 35). For the following experiments, the dominant line at λe = 1544.5 nm is filtered using a bandpass filter (green bar).
