We have studied the spin dynamics of confined electrons in an ultrathin CdTe/ZnTe quantum well and self-assembled quantum dots by time-resolved Kerr-rotation technique. The dependence of the spin-precession frequency on the magnetic field direction shows the anisotropy of the g-factor tensor, which is the opposite of the usual quantum wells with moderate widths. The geometrical anisotropy of the confinement also affects the initial orientation of the electron spins created optically, as revealed clearly with the use of oblique-incidence pump pulses.
We have investigated the exciton spin dynamics in an ultrathin CdTe/ZnTe single quantum well (QW) and self-assembled quantum dots (QDs) by observing time-resolved Kerr rotation (TRKR). At temperatures low enough to suppress the thermal escape of holes from the quantum-confinement structures, excitons dominate the TRKR signal. It shows characteristic dependence on the magnetic field, which is distinctly different from that of isolated electrons. From the data, we have estimated the electron-hole exchange energy to be 137 meV in the QW, and larger than 190 meV in the QDs.
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