Spin polarization of the L-gap surface states on Au(111)

Details Spin polarization of the L-gap surface states on Au(111) Spin polarization of the L-gap surface states on Au(111)

2003-05-22

arxiv.org/abs/cond-mat/0305530v1

Physics

Condensed Matter

22 pages with 8 figures

Scientific paper

10.1103/PhysRevB.68.165416

The electron spin polarization (ESP) of the L-gap surface states on Au(111) is investigated theoretically by means of first-principles electronic-structure and photoemission calculations. The surface states show a large spin-orbit induced in-plane ESP which is perpendicular to the in-plane wavevector, in close analogy to a two-dimensional electron gas with Rashba spin-orbit interaction. The surface corrugation leads to a small ESP component normal to the surface, being not reported so far. The surface-states ESP can be probed qualitatively and quantitatively by spin- and angle-resolved photoelectron spectroscopy, provided that the initial-state ESP is retained in the photoemission process and not obscured by spin-orbit induced polarization effects. Relativistic photoemission calculations provide detailed information on what photoemission set-ups allow to conclude from the photoelectron ESP on that of the surface states.

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