Scattering times in AlGaN/GaN two-dimensional electron gas from magnetotransport measurements

The various scattering times of two-dimensional electron gas were investigated in modulation-doped Al0.22Ga0.78N/GaN quantum wells by means of magnetotransport measurements. The ratio of transport and quantum scattering times, τt/τq∼1, shows that the dominant mobility-limiting mechanisms are short-range scattering potentials. The low-field magnetoresistance shows the weak antilocalization and localization phenomenon from which the spin–orbit scattering and inelastic scattering times are obtained. The inelastic scattering time is found to follow the T−1 law, indicating that electron–electron scattering with small energy transfer is the dominant inelastic process.