Sub-picosecond electron scattering time for /spl lambda/=1.55 /spl mu/m intersubband transitions in GaN/AlGaN multiple quantum wells

GaN-AlGaN multiple quantum wells with a subband spacing of -740 meV (/spl lambda/=1.67 /spl mu/m) have the time resolved pump-and-probe technique, with 1.55 /spl mu/m pump and 1.70 /spl mu/m probe wavelength. The measurement of an intersubband electron scattering time of 370 fs is reported.