Surface-state hole decay mechanisms: The Be(0001) surface

Physical Review B 64, 85334 - 5 (2001)

Surface-state hole decay mechanisms: The Be(0001) surface

V.M. Silkin, T. Balasubramanian, E.V. Chulkov, A. Rubio, P.M. Echenique

First-principle calculations and angle-resolved photoemission experiments are combined to analyze the different contributions to the surface-state hole dynamics at the Be(0001) surface. The computed inelastic electron-electron scattering rate γ is in good agreement with experiment once the electron-phonon contribution is subtracted. γ is strongly influenced by details of the surface band structure. In particular, the intraband transitions within the surface state itself ignored in traditional Fermi liquid theory contribute 65%-85% to γ. This intraband contribution and the highly spatial nonlocality of the self-energy makes the energy and momentum dependence of γ to be ∝(EF-E)α (with α<2) in contrast to the observed α≃2 value in noble and transition metal surfaces.

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