Quantum size effects in adatom island decay

Details Quantum size effects in adatom island decay Quantum size effects in adatom island decay

2005-03-23

arxiv.org/abs/cond-mat/0503574v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.166104

The decay of hexagonal Ag adatom islands on top of larger Ag adatom islands on a Ag(111) surface is followed by a fast scanning tunneling microscope. Islands do not always show the expected increase in decay rate with decreasing island size. Rather, distinct quantum size effects are observed where the decay rate decreases significantly for islands with diameters of 6 nm, 9.3 nm, 12.6 nm, and 15.6 nm. We show that electron confinement of the surface state electrons is responsible for this enhancement of the detachment barrier for adatoms from the island edge.

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