[SLAC Pubs and Reports]
Improved Superlattices for Spin-Polarized Electron Sources
Photoemission of polarized electrons from heterostructures based on
superlattices with minimum conduction-band offsets is investigated. The
the excitation energy dependence of the photoemission polarization degree with
calculated spectra makes it possible to determine the polarization losses at
stages of the photoemission. A maximum polarization of P = 91% and a quantum
efficiency of QE=0.5% are close to the best results obtained for photocathodes
based on strained semiconductor superlattices.
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