Details

Autor(en) / Beteiligte

• Clayburn, N. B.
• McCarter, J. L.
• Dreiling, J. M.
• Poelker, M.
• Ryan, D. M.
• Gay, T. J.

Titel

Search for spin-polarized photoemission from GaAs using light with orbital angular momentum

Ist Teil von

• Physical review. B, Condensed matter and materials physics, 2013-01, Vol.87 (3), Article 035204

Erscheinungsjahr

2013

Quelle

American Physical Society [PROLA]

Beschreibungen/Notizen

• Laser light with photon energy near the band gap of GaAs and in Laguerre-Gaussian modes with different amounts of orbital angular momentum was used to produce photoemission from unstrained GaAs. The degree of electron spin polarization was measured using a micro-Mott polarimeter and found to be consistent with zero with an upper limit of ~3% for light with up to + or -5h of orbital angular momentum. In contrast, the degree of spin polarization of 32.3 + or - 1.4% using circularly polarized laser light at the as the same wavelength, which is typical for bulk GaAs photocathodes.