Abstract
We investigate the local electronic properties of Fe atoms in a H/Fe3O4(001) film subsurface using scanning tunneling microscopy/spectroscopy (STS). Local barrier height measurements show a H-adsorption-induced reduction of the local work function, indicating electron transfer from H to surface atoms. The STS results and high-resolution spatial mapping of the occupied density of states near the Fermi level reveal that subsurface Fe atoms located beneath a OH group exhibit a metallic electronic state, different from the semiconducting state for intrinsic subsurface Fe atoms. These results can be explained by considering the extension of electron transfer to the subsurface layer.
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