@article{5745,
  author = {J. N. Heyman and K. Unterrainer and K. Craig and J. Williams and M. S. Sherwin and K. Campman and P. F. Hopkins and A. C. Gossard and B. N. Murdin and Cjgm Langerak},
  title = {Far-infrared pump-probe measurements of the intersubband lifetime in an AlGaAs/GaAs coupled-quantum well},
  abstract = {We report pump-and-probe measurements of the electron intersubband lifetime (T-1) in an AlGaAs/ GaAs heterostructure using a picosecond pulsed far-infrared laser. The subband spacing (11 meV) is less than the optical-phonon energy. Time-resolved measurements yield intersubband lifetimes ranging from T-1 = 1.1 +/- 0.2 ns to T-1 = 0.4 +/- 0.1 ns depending an measurement conditions. Results are in agreement with previous lifetime measurements on the same sample using continuous excitation at intensities less than or equal to 1 W/cm(2). The steady-state measurements yielded shorter lifetimes at high excitation intensities, possibly due to carrier heating leading to intersubband scattering by optical phonon emission. (C) 1996 American Institute of Physics.},
  year = {1996},
  journal = {Applied Physics Letters},
  volume = {68},
  number = {21},
  pages = {3019-3021},
  month = {May 20},
  isbn = {0003-6951},
  doi = {10.1063/1.116683},
  language = {eng},
}