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Localization of the Cu111 surface state by single Cu adatoms
F E Olsson1, M Persson, A G Borisov
1Department of Applied Physics, Chalmers/Göteborg University, S-41296 Göteborg, Sweden.
Abstract:
The Cu adatom-induced localization of the two-dimensional Shockley surface state at the Cu(111) surface was identified from experimental and simulated scanning tunneling microscopy spectra. The localization gives rise to a resonance located just below the surface state band edge. The adatom-induced surface state localization is discussed in terms of the existence theorem for bound states in any attractive two-dimensional potential. We also identify adatom-induced resonance states deriving from atomic orbitals in both experimental and simulated spectra.
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