Phonon dispersion at the Be(0001) surface

J. B. Hannon, E. J. Mele, and E. W. Plummer
Phys. Rev. B 53, 2090 – Published 15 January 1996
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Abstract

Measurements of surface-phonon dispersion at the Be(0001) surface are reported that are found to differ significantly from the predictions of an accurate model of the truncated bulk: the sign of the Rayleigh wave dispersion along the zone boundary is reversed in theory and experiment. The measured dispersion implies a reduction in the magnitude of noncentral forces at the surface. Such a reduction is compatible with the electronic structure of the Be(0001) surface, which is more free-electron-like than that of bulk Be due to a high density of surface states. We conclude that the properties of the surface states dominate the dynamics of surface atoms.

  • Received 18 May 1995

DOI:https://doi.org/10.1103/PhysRevB.53.2090

©1996 American Physical Society

Authors & Affiliations

J. B. Hannon and E. J. Mele

  • Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6396

E. W. Plummer

  • Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200
  • Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6057

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Vol. 53, Iss. 4 — 15 January 1996

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