[SLAC]
[SLAC Pubs and Reports]
SLAC-PUB-12249
Improved Superlattices for Spin-Polarized Electron Sources
Abstract
Photoemission of polarized electrons from heterostructures based on
InAlGaAs/GaAs
superlattices with minimum conduction-band offsets is investigated. The
comparison of
the excitation energy dependence of the photoemission polarization degree with
the
calculated spectra makes it possible to determine the polarization losses at
different
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
that are
based on strained semiconductor superlattices.
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