Temperature dependence of the optical properties in GaMnN

Temperature-dependent transmission measurements are carried out on ion-implanted GaMnN with different Mn-implantation doses. With a detailed procedure developed for analyzing the transmission spectra, we obtain the temperature effects in optical properties of GaMnN (including GaN), such as absorption coefficient, band gap, Urbach band tail characteristics, refractive index, and extinction coefficient. Two sets of temperature- and photon energy-dependent empirical formulas are established, which not only unify the various experimental data reported in the literature, but also provide an experimental database of optical properties in GaMnN. Furthermore, we reveal that the dependence of these optical properties on the Mn-implantation doses is closely related to the impact of Mn on the crystal structure.