TITLE

Spin-polarized photoemission from AlGaAs/GaAs heterojunction: A convenient highly polarized electron source

AUTHOR(S)
Ciccacci, F.; Drouhin, H.-J.; Hermann, C.; Houdré, R.; Lampel, G.
PUB. DATE
February 1989
SOURCE
Applied Physics Letters;2/13/1989, Vol. 54 Issue 7, p632
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We analyze the operation of a spin-polarized electron source, consisting of a 100 Ã… GaAs cap on top of Al0.3Ga0.7As, excited at 300 or 120 K by a He-Ne laser. The cap allows easy activation to negative electron affinity while the alloy permits gap matching to the light source, and thus large electron spin polarization (30% at 300 K, 36% at 120 K). We compare yield curves, energy distribution curves, and polarized energy distribution curves obtained on samples with 100 and 1000 Ã… caps and on bulk GaAs. The X conduction minimum position in the alloy is also determined.
ACCESSION #
9829962

 

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