The spin relaxation process of In 0.53Ga 0.47As/ AlAs 0.56Sb 0.44 quantum wells is investigated by spin-dependent pump and probe reflectance measurements with a high time resolution of 200 fs. The observed spin relaxation time of 17.5 ps at 20 K indicates high potential for applications to high-speed optical devices. A positive temperature dependence of the spin relaxation time due to the unique band structure is observed at 30-100 K. The spin relaxation is found to be mainly governed by the Bir-Aronov-Pikus process [Sov. Phys. JETP 42, 705 (1976)] below 100 K and by the D'yakonov-Perel' process above 100 K.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)