| Title | Saturation absorption studies of intersubband relaxation rates in a p-GaAs/AlGaAs QW using a free electron laser |
| Publication Type | Journal Article |
| Year of Publication | 1998 |
| Authors | B.E Cole, C Langerak, B.N Murdin, C.D Bezant, J.M Chamberlain, C.R Pidgeon, M. Henini, V. Nakov |
| Journal | Physica E |
| Volume | 2 |
| Number | 1-4 |
| Pagination | 181-185 |
| Date Published | Jul |
| ISBN Number | 1386-9477 |
| Abstract | We present saturation absorption studies of the HH1 --> LH1 intersubband transition in a 70 Angstrom p-type GaAs/AlGaAs multi-quantum well. The subband separation in this sample, with strongly non-parabolic bands, varies from 26 meV at k = 0 to 16 meV at the Fermi wave vector. The absorption behaviour of this transition is studied over a range of four orders of magnitude of intensity of incident THz radiation. The results are analysed within the contexts of a simple two-level model and an instantaneous thermalization model. The results indicate that the lifetime obtained with these models is limited by the pulsewidth, i.e. is greater than 1.7 ps. This places a lower limit on the energy relaxation lime for transitions below the LO-phonon energy. (C) 1998 Elsevier Science B.V. All rights reserved. |
| DOI | 10.1016/s1386-9477(98)00039-3 |
| PID | dae72a67ba42c3c11afa601568fad747 |
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