Al [ital L][sub 2,3] core excitons in Al[sub [ital x]]Ga[sub 1[minus][ital x]]As studied by soft-x-ray reflection and emission

Journal Article · Tue Dec 15 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.15116· OSTI ID:6957119

Dong, Q; O'Brien, W L; Jia, J J; Callcott, T A ^[1]; Mueller, D R; Ederer, D L ^[2]

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1. University of Tennessee, Knoxville, Tennessee 37996 (United States)
2. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)

The Al [ital L][sub 2,3] soft-x-ray reflection and emission spectra of Al[sub [ital x]]Ga[sub 1[minus][ital x]]As have been measured for [ital x] between 0.17 and 1.0. The valence-band maximum was monitored via the emission spectra using a fit based on band-structure parameters. The dominant features in the reflection spectra are produced by the [ital L][sub 2,3] core excitons. Since both the reflection spectra and emission spectra were obtained using the same soft-x-ray spectrometer, the energies of the excitons above the valence-band maximum are accurately obtained. The known values of the optical band gap, as a function of [ital x], are then used to determine the core exciton binding energy. The core excitons are found to follow and lie above the conduction-band minimum by 0.3 eV as the Al composition changes. Our results are compared to various core exciton theories and to previous experiments.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6957119
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:23; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
BINDING ENERGY
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
EMISSION SPECTRA
ENERGY
ENERGY GAP
EXCITONS
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
IONIZING RADIATIONS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PNICTIDES
QUASI PARTICLES
RADIATIONS
REFLECTIVITY
SPECTRA
SURFACE PROPERTIES
X RADIATION