Abstract:

The ultrafast dynamics of spin and magnetization in semiconductor nanostructures and ferromagnetic semiconductor heterostructures have been under investigation by employing time-resolved ultrafast linear and nonlinear magneto-optics. In this talk, I will briefly introduce some experimental studies we are doing now or trying to do in near future. These include: 1) spin relaxation and dephasing as well as ultrafast magnetization manipulation in GaMnAs and III-V group low dimensional materials based on time-resolved Kerr rotation (TR-MOKE) and photoluminescence (TR-PL) techniques; 2) interfacial spin dynamics of spin-injection-based heterostructures such as Fe/GaAs, MnAs/GaAs, GaMnAs/GaAs, by using the magnetic field enhanced second harmonic generation technique (MSHG); 3) Spin diffusion and relaxation manipulation in III-V and IV-group two dimensional electron gas (2DEG) through control of spin-orbital coupling; studying huge anisotropic spin relaxation and searching for spin helix, based on the transient spin grating technique.
 
 
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