Sr. Schmidt et al., Observation of intersubband real-space transfer in GaAs/AlAs quantum-well structures due to Gamma-X mixing, APPL PHYS L, 78(9), 2001, pp. 1261-1263
The Gamma (2)-X-z1 intersubband dynamics in GaAs/AlAs quantum-well structur
es is investigated by time-resolved infrared pump and probe experiments. In
the studied structure, the second Gamma level in GaAs is nearly resonant t
o the first X-z level in AlAs, resulting in elastic Gamma -X scattering. A
biexponential behavior of ground-state recovery has been found with a time
constant in the order of 1 ps for the Gamma (2)-Gamma (1) relaxation and a
time constant of 7 ps (at 10 K), which represents the X-z-Gamma (2) transfe
r. (C) 2001 American Institute of Physics.