Abstract
We present the results of a photoelectron spectroscopy study of the K/GaP(110) interface grown at T = 120 K. We have investigated the system looking at the Ga 3d and P 2p core level spectra by analysing their lineshape. This analysis shows that the transferred charge in the adatom-substrate bonding formation affects the electronic and chemical environment of both surface Ga and P atoms. The results suggest relevant differences with the intuitive picture of strong ionic localized bonding between the alkali atom and surface Ga. They are instead more consistent with a delocalized redistributed valence charge between the adsorbate and the substrate. We also conclude that the system at Θ = 1 ML is metallic, with an increasing disorder and inhomogeneity at the highest coverage studied. The similarities and differences with the Na/GaP(110) and the other alkali metal/GaAs(110) system are discussed.
Original language | English |
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Pages (from-to) | 2861-2871 |
Number of pages | 11 |
Journal | Journal of Physics Condensed Matter |
Volume | 10 |
Issue number | 13 |
DOIs | |
Publication status | Published - 06 Apr 1998 |