Ganichev, Sergey and Danilov, Sergey and Belkov, Vassilij and Ivchenko, Eougenious and Wegscheider, Werner and Weiss, Dieter and Bichler, Max
Spin-Sensitive Bleaching and Monopolar Spin Orientation in Quantum Wells.
Physical Review B 88 (5), 057401.
Spin-sensitive bleaching of the absorption of far-infrared radiation has been observed in p-type GaAs/AlGaAs quantum well structures. The absorption of circularly polarized radiation saturates at lower intensities than that of linearly polarized light due to monopolar spin orientation in the first heavy-hole subband. Spin relaxation times of holes in p-type material in the range of tens of ps were derived from the intensity dependence of the absorption.