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4 páginas, 4 figuras.-- PACS number(s): 73.21.Fg, 73.20.Mf, 79.60.Dp.-- et al.We report on low-energy dynamical surface response properties of the p(2×2)K/Be(0001) system calculated within a first-principles approach. It is shown that a partly occupied adsorbate-induced quantum-well band dramatically affects the dynamical properties of the beryllium surface. We demonstrate clear evidence that the observed anomalous features in photoemission spectra of this and a similar system can be explained by acoustic surface plasmon excitations.We acknowledge partial support from the University of\udthe Basque Country (Grant No. GIC07IT36607), the Departamento\udde Educación del Gobierno Vasco, and the Spanish\udMinisterio de Ciencia y Tecnología (MCyT) (Grant No.\udFIS200766711C0101).Peer reviewe

physical review b

Photoelectron driven acoustic surface plasmons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mn>2</mml:mn><mml:mo>×</mml:mo><mml:mn>2</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mtext>K</mml:mtext><mml:mo>/</mml:mo><mml:mtext>Be</mml:mtext><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mn>0001</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>:<i>Ab initio</i>calculations

Photoelectron driven acoustic surface plasmons inp(2×2)K/Be(0001):Ab initiocalculations