Angle-resolved electron-energy-loss study of Al/Si(111)

Journal Article · Fri Oct 15 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.12063· OSTI ID:5905599

Akavoor, P; Glander, G S; Kesmodel, L L; Burke, K ^[1]

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1. Department of Physics, Indiana University, Swain West 117, Bloomington, Indiana 47405 (United States)

We have performed a high-resolution electron-energy-loss study of the Si(111)-([radical]3 [times] [radical]3 )[ital R]30[degree]:Al surface and have measured the dispersions of several surface phonons along the [Gamma][ital [bar K]] direction. We interpret these using two different simple lattice dynamical models, both employing force constants from an [ital ab] [ital initio] electronic-structure calculation of Northrup. The first yields quantitative information at [ital q]=0; the second is a semiquantitative estimate of the dispersion. These models have no adjustable parameters. The good agreement with the experiment for most of the observed modes indicates that a single theory can explain both the electronic structure and vibrational modes of this surface and also illustrates both the usefulness and limitations of simple models of lattice dynamics.

• DOE Contract Number: FG02-84ER45147
• OSTI ID: 5905599
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:16; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ALUMINIUM
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY-LOSS SPECTROSCOPY
METALS
PHONONS
QUASI PARTICLES
SEMIMETALS
SILICON
SPECTROSCOPY
SURFACE PROPERTIES