Sub-picosecond electron scattering time for λ≃ 1.55µm intersubband transitions in GaN/AlGaN multiple quantum wells

Abstract

GaN/AlGaN multiple quantum wells with a subband spacing of ~740 meV (λ = 1.67 µm) have been studied. Using the time-resolved pump-and-probe technique, with 1.55 µm pump and 1.70 µm probe wavelength, the measurement of an intersubband electron scattering time of 370 fs is reported.