Abstract
We present an experimental and theoretical investigation of the spin-dependent electronic structure of a Ag monolayer on Fe(100). By spin- and angle-resolved photoemission we identify several spin-polarized states of two-dimensional (2D) character and determine their band dispersion. The experimental results are compared with ab initio band-structure calculations. Three kinds of spin-polarized 2D states could be identified along the \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{}-X\ifmmode\bar\else\textasciimacron\fi{} high-symmetry direction of the surface Brillouin zone: (i) 3d-derived Fe surface states which are only weakly modified by the Ag overlayer; (ii) Fe surface states with a substantial sp character which, upon adsorption of a Ag overlayer, hybridize with the Ag atoms and form interface states; (iii) Ag-induced spin-polarized interface states which are shared by both of the constituents of the interface atoms and do not have any counterpart at the clean Fe surface.
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