Reflection high-energy electron diffraction and photoemission study of GaSb(100) reconstructions
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080 (United States)
The clean GaSb(100) surface exhibits a variety of reconstructions, including a {ital c}(2{times}10), a {ital c}(2{times}6), and a (1{times}3)/{ital c}(2{times}6), in order of a decreasing surface Sb/Ga ratio. Core-level photoemission spectroscopy and reflection high-energy electron diffraction were employed to study each of these reconstructions in detail. Our results show that the {ital c}(2{times}6) and (1{times}3)/{ital c}(2{times}6) surfaces have significantly different stoichiometries and core-level line shapes, and are, in fact, different reconstructions, rather than variations of the same {ital c}(2{times}6) surface due to disorder. Analysis of the photoemission data taken with a wide range of incident photon energy suggests that the {ital c}(2{times}10) surface is very Sb rich, with more than 2 ML of Sb, while the {ital c}(2{times}6) has 1--2/3 ML of Sb, and the (1{times}3)/{ital c}(2{times}6) has about 1--2/3 ML of Sb with 1/3 ML of Ga atoms intermixed on the surface. Quantum-mechanical diffraction and interference effects are found to significantly affect the measurement of surface-to-bulk photoemission intensity ratios. Surface structure models are presented for each reconstruction which are consistent with the observed data.
- Research Organization:
- University of Illinois
- DOE Contract Number:
- FG02-91ER45439
- OSTI ID:
- 115886
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 11 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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