Photo-luminescence study of superlattice photocathode

Details Photo-luminescence study of superlattice photocathode Photo-luminescence study of superlattice photocathode

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..930m&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 930-934 (2001).

Physics

Electron Sources, Polarized Beams, Photomultipliers, Phototubes And Photocathodes

Scientific paper

Luminescence with high circular polarization was observed in the InGaAs-AlGaAs strained layer superlattice which was designed as a spin polarized electron source. The maximum luminescence polarization of 65% was obtained around 1.60 eV which corresponded to the lowest band gap. The dependence of luminescence polarization on the excitation photon energy reflected the valence band structure split by the internal strain and the quantum confinement effect. The spin polarization of conduction band electrons at the instant of excitation was found to be 94% from the lifetime and the spin relaxation time measured by the time-resolved luminescence measurement. .

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