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.
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Gmachl et al. (2001) studied this question.
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