Fig. 4: Exciton redistribution among localized QEs.
From: Strain-induced exciton redistribution among quantum emitters in two-dimensional materials
a Spatially resolved micro-PL map of pillar #2 shown in Fig. 1d). b Spatially resolved micro-PL map of light emitted by QE1, QE2, and QE3 for Fp = −10 kV/cm. The maps are extracted separately from a hyperspectral map of PL spectra and making multi-Gaussian fits of the single PL spectrum in each pixel to identify the intensity of the light emitted by the single QE in each position of the whole 2D map. Each map of an individual QE is separately normalized to its maximum along the electric field sweep. The white area corresponds to regions where the QE’s intensity is smaller than 10% of its maximum. c The same as (b) for Fp = 10 kV/cm. d The same as (b) for Fp = 30 kV/cm. e Micro-PL spectra recorded at the position marked by the white spot in (a). The spectra show the evolution from −10 kV/cm to 30 kV/cm. The orange dots highlight the QE3 expected position, showing the emitter’s disappearance. The dashed orange and red arrows guide eyes to follow QE2 and QE3. f Integrated area of the panchromatic PL spectrum as a function of Fp in different regions over the pillar. Brown dots refer to the total pillar area, while the green and purple dots refer to the two ellipses shown with the same color in (a), labelled as Zone 1 and Zone 2, respectively. We estimated an error of 10% from an analysis of integrated PL vs time, and reported it for three points as an example. g Normalized integrated area of the PL intensity of the three QEs studied in (b–d) as a function of Fp. The uncertainty in the intensities is estimated to be around 15%, as discussed in supplementary, Note 3. h Energy shifts of the three QEs studied in (b–d) as a function of Fp. The solid lines are linear fits to the experimental data, while m stands for the energy shift rate.
