Friday, September 2, 2011, 4:00 pm — Large Conference Room, Bldg. 911B
AlInGaAs/AlGaAs superlattices (SL) with strained quantum wells are known to be a very reliable source for polarized electron beams. To achieve a polarization exceeding the existing 90%, a better understanding of the spin polarized electron transport within the crystal is essential. Time resolved measurements of the charge distribution and the polarization have been performed with a resolution of 1 ps. It was found that the decay of a SL cannot be described by the diffusion model, which is very successful on bulk photocathodes. In addition, a series of SL with varying thickness has been studied. The results give strong evidence that additional localized states slow down the electron transport and lead to noticeable losses of charge and polarization.
Hosted by: Coordinator: Chuyu Liu
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