Kainz, Josef and Schneider, Petra and Ganichev, Sergey and Rössler, Ulrich and Wegscheider, Werner and Weiss, Dieter and Prettl, Wilhelm and Belkov, Vassilij and Golub, Leonid and Schuh, Dieter
Hole Spin-Relaxation in Quantum Wells from Saturation of Inter-Subband Absorption.
Physica E 22, pp. 418-421.
Other URL: http://www.physik.uni-regensburg.de/forschung/ganichev/reprints/physicaE2004p418saturation.pdf
Spin-sensitive saturation of absorption of infrared radiation has been investigated in p-type GaAs QWs. It is shown that the absorption saturation of circularly polarized radiation is mostly controlled by the spin relaxation time of the holes. The saturation behavior has been investigated for di:erent QW widths and in dependence on the temperature with the result that the saturation intensity substantially decreases with smaller QW width. Spin relaxation times were experimentally obtained
by making use of calculated (linear) absorption coe;cients for inter-subband transitions. The question of selection rules for intersubband transitions between hole subbands is addressed.