Fig. 3: Statistical analysis of the exciton properties for Cu2O micro-particle arrays.
From: Bottom-up fabrication of 2D Rydberg exciton arrays in cuprous oxide
a Energy of 1s-orthoexciton (statistical average over many arrays having the same size) from regions of all sizes. Here, for all regions, the energies of yellow 1s-orthoexciton peaks in arrays showed a redshift compared to the thin-film sample (black dashed line). b Linewidth (FWHM) of yellow 1s-orthoexciton from all Cu2O arrays. The 1s-orthoexciton peak from the thin-film sample (black dashed line) demonstrated a narrower linewidth than arrays. c The effective temperature of excitons from all regions extracted by fitting the phonon-assisted transition using a Maxwell-Boltzmann distribution function convoluted with a Gaussian. The black dashed line depicts the effective exciton temperature for the thin-film sample, whereas the brown dashed line is the temperature of the cryostat sample stage. The effective temperature of the excitons was different from the sample stage temperature, which was fixed at 6.3 K. On the other hand, for thin-film samples, the effective exciton temperature was much smaller, around 12.07 K. The sample temperature was different from the cryo stage temperature because of the poor thermal conductivity of the quartz substrate. The higher effective exciton temperatures for arrays contributed to the linewidth broadening and redshift of the 1s-orthoexciton peak. Error bars are statistical error bars for all figures.
