Size-dependent surface states of strained cobalt nanoislands on Cu(111) |
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Authors: | Rastei M V Heinrich B Limot L Ignatiev P A Stepanyuk V S Bruno P Bucher J P |
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Affiliation: | Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Université Louis Pasteur, F-67034 Strasbourg, France. |
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Abstract: | Low-temperature scanning tunneling spectroscopy over Co nanoislands on Cu(111) showed that the surface states of the islands vary with their size. Occupied states exhibit a sizable downward energy shift as the island size decreases. The position of the occupied states also significantly changes across the islands. Atomic-scale simulations and ab initio calculations demonstrate that the driving force for the observed shift is related to size-dependent mesoscopic relaxations in the nanoislands. |
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