Determination of the Fermi level position in dilute magnetic Ga1-xMnxN films

作者：Barthel S^*; Kunert G; Gartner M; Stoica M; Mourad D; Kruse C; Figge S; Hommel D; Czycholl G

来源：Journal of Applied Physics, 2014, 115(12): 123706.

DOI：10.1063/1.4869134

We report on a combined theoretical and experimental determination of the Fermi level position in wurtzite Ga1-xMnxN films with x = 4% and x = 10% as grown by molecular beam epitaxy. By means of ellipsometric measurements, the real part of the frequency-dependent conductivity is determined. An electronic model in the framework of the effective bond-orbital model is parameterized in order to theoretically reproduce the measured transport properties. Predictions for the long-wavelength behaviour as a function of the Fermi level are made. The corresponding density of states obtained in this model is in qualitative agreement with first-principle calculations. The absence of a significant experimental peak in the AC conductivity for small frequencies indicates that the Fermi level lies in a gap between two Mn-related impurity bands in the host band gap.

• 出版日期2014-3-28