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Phys. Rev. B 82, 125102 (2010) [5 pages]

Dielectric screening and band-structure effects in low-energy photoemission

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E. E. Krasovskii1,2,3, V. M. Silkin1,2,3, V. U. Nazarov4, P. M. Echenique1,2,5, and E. V. Chulkov1,2,5
1Departamento de Física de Materiales, Facultad de Ciencias Químicas, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, Apdo. 1072, San Sebastián/Donostia, 20080 Basque Country, Spain
2Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, San Sebastián/Donostia, 20018 Basque Country, Spain
3IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
4Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan
5Centro de Física de Materiales (CFM), Materials Physics Center (MPC), Centro Mixto CSIC–UPV/EHU, Edificio Korta, Avenida de Tolosa 72, 20018 San Sebastián, Spain

Received 21 July 2010; published 3 September 2010

Nonlocal response of the surface to the incident light is included into an ab initio one-step photoemission theory. Surface-state normal emission spectra from Be(0001) and Al(100) are calculated by a full-potential scattering method and are found to agree well with the experiment in a wide energy range. The total exciting field is obtained within the random-phase approximation for jellium as well as for one-dimensional crystal models of the two surfaces. Material dependence of the multipole plasmon mode and strong effect of band structure on the photoyield is discussed.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.82.125102
DOI:
10.1103/PhysRevB.82.125102
PACS:
79.60.-i, 73.20.Mf
 
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