Electron-Phonon Interaction at the Si(111)7×7 Surface

I. Barke, Fan Zheng, A. R. Konicek, R. C. Hatch, and F. J. Himpsel
Phys. Rev. Lett. 96, 216801 – Published 31 May 2006

Abstract

It is shown that electron-phonon interaction provides a natural explanation for the unusual band dispersion of the metallic surface states at the Si(111)(7×7) surface. Angle-resolved photoemission reveals a discontinuity of the adatom band at a binding energy close to the dominant surface phonon mode at ω0=70meV. This mode has been assigned to adatom vibrations by molecular dynamics calculations. A calculation of the spectral function for electron-phonon interaction with this well-defined Einstein mode matches the data. Two independent determinations of the electron-phonon coupling parameter from the band dispersion and from the temperature-dependent phonon broadening yield similar values of λ=1.09 and λ=1.06.

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  • Received 14 December 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.216801

©2006 American Physical Society

Authors & Affiliations

I. Barke, Fan Zheng, A. R. Konicek, R. C. Hatch, and F. J. Himpsel

  • Department of Physics, University of Wisconsin Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA

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Issue

Vol. 96, Iss. 21 — 2 June 2006

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