Fig. 4: Statistical analysis of yellow Rydberg exciton energies for all Cu2O arrays having nominal side lengths from 4 μm to 16 μm.
From: Bottom-up fabrication of 2D Rydberg exciton arrays in cuprous oxide
a The variation in the energies of 2p, 3p, 4p, and 5p excitons was examined across arrays of different dimensions. The dashed line represents the exciton energies observed in a thin-film sample. In all instances, the exciton energies within the arrays exhibited a red shift relative to the thin-film sample. b FWHM linewidths of the 2p, 3p, 4p, and 5p excitons and their variation for all arrays of different sizes. c Rydberg exciton energies as a function of n averaged over all regions with different nominal sidelengths from 4 μm to 16 μm. The black dashed line shows the n−2 trend of the hydrogenic energy levels from bulk natural Cu2O sample. The 2p, 3p, and 4p exciton energy followed the trendline, whereas the 5p exciton significantly deviated from it. d FWHM of yellow exciton series a function of principal quantum number (n). The black dashed line shows the n−3 trend. For 4p and 5p exciton, their linewidths significantly deviated from the trendline and reached a plateau for higher principal quantum numbers. Error bars are statistical error bars for all figures.
