TY - JOUR T1 - FAR-INFRARED SATURATION SPECTROSCOPY OF A SINGLE SQUARE-WELL JF - Semiconductor Science and Technology Y1 - 1994 A1 - Craig, K. A1 - Felix, C. L. A1 - Heyman, J. N. A1 - Markelz, A. G. A1 - Sherwin, M. S. A1 - Campman, K. L. A1 - Hopkins, P. F. A1 - Gossard, A. C. AB -
We have performed saturation spectroscopy measurements of the lowest intersubband transition in a single 400 angstrom GaAs/Al0.3Ga0.7As modulation-doped square quantum well. We couple intense tunable far-infrared radiation from the Santa Barbara free electron laser into our sample using an edge-coupling technique and measure absorption as a function of frequency and intensity. Saturation and frequency shifts in the absorption line are clearly observed. We attribute the frequency shifts to reductions in the many-body depolarization shift. From our preliminary measurements, we estimate the intersubband relaxation time to be 600 ps to within a factor of three.
VL - 9 SN - 0268-1242 N1 - Sherwin, Mark S/Q-4762-2017