Size-dependent surface states of strained cobalt nanoislands on Cu(111).
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.
Rastei
M V
MV
Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Université Louis Pasteur, F-67034 Strasbourg, France.
Heinrich
B
B
Limot
L
L
Ignatiev
P A
PA
Stepanyuk
V S
VS
Bruno
P
P
Bucher
J P
JP