Resident electrons spin formation and spin dephasing in a single CdTe quantum well

Abstract

We report on the dephasing time of resident electron spin polarization under pump and control excitation in a single CdTe quantum well (QW) by a time-resolved Kerr rotation (TRKR) method. The distribution and magnitude of the resident electron spin polarizations can be varied by control pulse. We found the spin dephasing time decreases largely with the increasing spin polarization magnitude under circularly pump pulse excitation. What is more, spin vector dispersions induced by control pulse can shorten the spin dephasing time.