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Phys. Rev. Lett. 95, 176802 (2005) [4 pages]

Role of Elastic Scattering in Electron Dynamics at Ordered Alkali Overlayers on Cu(111)

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C. Corriol1, V. M. Silkin1, D. Sánchez-Portal1,2, A. Arnau1,2,3, E. V. Chulkov1,2,3, P. M. Echenique1,2,3, T. von Hofe4, J. Kliewer4,*, J. Kröger4, and R. Berndt4
1Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, San Sebastian 20018, Spain
2Centro Mixto C.S.I.C.-UPV/EHU, Facultad de Química, Apartado 1072, San Sebastian 20080, Spain
3Departamento de Física de Materiales, Facultad de Química, Apartado 1072, San Sebastian 20080, Spain
4Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany

Received 14 April 2005; published 19 October 2005

Scanning tunneling spectroscopy of p(2×2) Cs and Na ordered overlayers on Cu(111) reveals similar line widths of quasi-two-dimensional quantum well states despite largely different binding energies. Detailed calculations show that 50% of the line widths are due to electron-phonon scattering while inelastic electron-electron scattering is negligible. The mechanism of enhanced elastic scattering due to Brillouin zone backfolding contributes the remaining width.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.176802
DOI:
10.1103/PhysRevLett.95.176802
PACS:
73.20.At, 68.37.Ef, 71.20.Gj, 73.21.Fg

*Present address: Infineon Technologies AG, D-81609 München, Germany.

 
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