Extended Data Fig. 7: LSW fit of photoluminescence-spectra on hex-Ge.

LSW fits were performed both on low-temperature (4 K), excitation-density-dependent photoluminescence spectra of hex-Ge as plotted in Fig. 3a, as well as on a temperature series of photoluminescence spectra of hex-Ge at an excitation density of 1.8 kW cm⁻² as plotted in Fig. 3b. Additional fitting results are given here, with a full description of the model given in the Methods section ‘The LSW model’. a, d, The bandgap and the quasi-Fermi-level splitting as a function of excitation density and temperature, respectively. b, e, The electron temperature as function of excitation density and temperature, respectively. c, f, The Urbach-tail coefficient γ also as a function of excitation density and temperature, respectively. g, An LSW fit, plotted as a dashed green line, which was performed on a low-excitation-density (ExDens) (45 W cm⁻²) photoluminescence spectrum, plotted as a red line, at a temperature of 80 K. Two vertical dotted lines indicate the bandgap (BG) on the left in black and the quasi-Fermi-level splitting Δμ to the right in blue. At this lattice temperature all dopants are ionized and the Δμ equals the electron-Fermi level, so these numbers are used to determine the electron quasi-Fermi level.