Physics – Condensed Matter – Materials Science
Scientific paper
1999-01-21
Phys. Rev. B 59, 10591 (1999)
Physics
Condensed Matter
Materials Science
10 pages, 5 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.59.10591
The role of the intrinsic surface state ($n=0$) in the decay of the first image state ($n=1$) at the (111) surface of copper is investigated. Inelastic linewidths are evaluated from the knowledge of the imaginary part of the electron self-energy, which we compute, within the GW approximation of many-body theory, by going beyond a free-electron description of the metal surface. Single-particle wave functions are obtained by solving the Schr\"odinger equation with a realistic one-dimensional model potential, and departure of the motion along the surface from free-electron behaviour is considered through the introduction of the effective mass. The decay of the first image state of Cu(111) into the intrinsic surface state is found to result in a linewidth that represents a 40% of the total linewidth. The dependence of linewidths on the momentum of the image state parallel to the surface is also investigated.
Chulkov Evgueni V.
Echenique Pedro M.
Osma J.
Pitarke J. M.
Sarria I.
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