研究目的
Investigating the drift and diffusion dynamics of spin wave packets under spin–orbit effective magnetic fields in two-dimensional electron systems.
研究成果
The study confirmed that the spin phase velocity in drifting spin wave packets changes from a large negative value to a small positive value over time, as predicted by the simplified model. The phase velocity is characterized by spin–orbit parameters and the size ratio between the instantaneous and initial wave packets. The findings are applicable to a wide variety of semiconductor 2D systems.
研究不足
The spatial resolution of Kerr rotation measurements was limited by the FWHM of the probe spot, approximately 3 μm. The study could not obtain the exact saturation value of the spin phase velocity in the experiment.
1：Experimental Design and Method Selection:
The study employed Kerr rotation microscopy with a mode-locked Ti:sapphire laser to investigate the spatial evolution of drifting spin packets locally injected into a GaAs quantum well.
2：Sample Selection and Data Sources:
A 2DEG formed in a 15-nm-thick GaAs/AlGaAs QW was used.
3：List of Experimental Equipment and Materials:
Mode-locked Ti:sapphire laser, motorized stages for spatially resolved Kerr rotation measurements.
4：Experimental Procedures and Operational Workflow:
Circularly polarized pump pulses generated spin-polarized electrons, and linearly polarized pulses with a time delay probed the spin density via the Kerr rotation angle.
5：Data Analysis Methods:
The spin phase velocity was analyzed using a simplified model with a spin drift-diffusion equation and Monte-Carlo simulations.
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