Strain enhanced electron spin polarization observed in photoemision from InGaAs
- Stanford Linear Accelerator Center, Menlo Park, CA (USA)
- Wisconsin Univ., Madison, WI (USA). Dept. of Physics
- California Univ., Berkeley, CA (USA)
Electron spin polarization in excess of 70% has been observed in photoemission from a 0.1 {mu}m-thick epitaxial layer of In{sub x}Ga{sub 1-x}As with x {approx} 0.13 grown on a GaAs substrate. Under these conditions, the epitaxial layer is expected to be highly strained by the 0.9% lattice mismatch, as confirmed by X-ray diffractometer measurements of the lattice parameter. The electron polarization and the quantum efficiency have been measured as a function of the excitation photon energy from 1.25 to 2.0 eV. A significant enhancement of the electron polarization occurs in the vicinity of 1.33 eV where the expected strain-induced level splitting permits optical excitation of a single band transition. Measurements made on a control sample of 1.14 {mu}m thickness, significantly larger than the critical thickness for pseudomorphic strain, show no polarization enhancement. These measurements represent the first observation of strain-enhanced electron spin polarization for photoemitted electrons. 7 refs., 3 figs.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (USA)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF); USDOE, Washington, DC (USA); National Science Foundation, Washington, DC (USA)
- DOE Contract Number:
- AC03-76SF00515; AC02-76ER00881
- OSTI ID:
- 5843183
- Report Number(s):
- SLAC-PUB-5546; CONF-910505-84; WISC-ex-91-317; ON: DE91012319; CNN: NSF-87-11709
- Resource Relation:
- Conference: 1991 Institute of Electrical and Electronics Engineers (IEEE) particle accelerator conference (PAC), San Francisco, CA (USA), 6-9 May 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON SOURCES
GALLIUM ARSENIDES
PHOTOEMISSION
INDIUM COMPOUNDS
LINEAR ACCELERATORS
PHOTOCATHODES
SPIN ORIENTATION
ACCELERATORS
ARSENIC COMPOUNDS
ARSENIDES
CATHODES
ELECTRODES
EMISSION
GALLIUM COMPOUNDS
ORIENTATION
PARTICLE SOURCES
PNICTIDES
RADIATION SOURCES
SECONDARY EMISSION
430301* - Particle Accelerators- Ion Sources
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)