Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band structure effects on the Be(0001) acoustic-surface-plasmon energy
  dispersion   We report first-principles calculations of acoustic surface plasmons on the
(0001) surface of Be, as obtained in the random-phase approximation of
many-body theory. The energy dispersion of these collective excitations has
been obtained along two symmetry directions. Our results show a considerable
anisotropy of acoustic surface plasmons, and underline the capability of
experimental measurements of these plasmons to {\it map} the electron-hole
excitation spectrum of the quasi two-dimensional Shockley surface state band
that is present on the Be(0001) surface.

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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga