Systematic study of polarized electron emission from strained GaAs∕GaAsP superlattice photocathodes
| Autor: | C. Y. Prescott, A. M. Moy, Axel Brachmann, R.E. Kirby, T. Maruyama, J. Jiang, S. Harvey, E. L. Garwin, R. Prepost, J.E. Clendenin, Dah An Luh |
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| Rok vydání: | 2004 |
| Předmět: |
Physics - Instrumentation and Detectors
Materials science Physics and Astronomy (miscellaneous) Superlattice FOS: Physical sciences Instrumentation and Detectors (physics.ins-det) Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Polarization (waves) Molecular physics Spectral line Cathode law.invention Condensed Matter::Materials Science law Quantum efficiency Molecular beam epitaxy |
| Zdroj: | Applied Physics Letters. 85:2640-2642 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.1795358 |
| Popis: | Spin-polarized electron photoemission has been studied for GaAs/GaAs$_{1-x}$P$_x$ strained superlattice cathodes grown by gas-source molecular beam epitaxy. The superlattice structural parameters are systematically varied to optimize the photoemission characteristics. The heavy-hole and light-hole transitions are reproducibly observed in quantum efficiency spectra, enabling direct measurement of the band energies and the energy splitting. Electron-spin polarization as high as 86% with over 1% quantum efficiency has been observed. |
| Databáze: | OpenAIRE |
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