Figure 1: PLE and power-dependent PL spectra of the sample.
From: Biexcitonic molecules survive excitons at the Mott transition
(a) PLE (black dots, solid line is a guide to the eye) and PL (red solid line) spectrum of the sample at moderate excitation. The localization energy ~1 meV is deduced by comparing the exciton energy in the PLE and the PL spectra. (b) Power-dependent PL spectra of the sample under CW laser excitation. The excitation power density changes from 3 up to 3,000 W cm−2 from the lowest to the highest spectrum, respectively. (c) PL intensity of the exciton (red) and biexciton (black) peaks as a function of excitation power density. The linear and quadratic dependencies of the exciton and biexciton PL intensities at low injection confirm the assignment of these two peaks to excitons and biexcitons, respectively.
