Abstract
Cu nanostripes with finite arrays of monatomic steps are self-assembled by Ag-induced faceting of vicinal Cu(111) surfaces. By varying the amount of Ag in the submonolayer range one can tune the internal step spacing of Cu stripes, while decreasing its total width . We can observe, by means of angle-resolved photoemission, a progressive transition from two-dimensional surface bands to one-dimensional quantum well states as decreases. A direct comparison between surface states of infinite vicinals and nanostripes with the same indicates a small upwards energy shift in the latter, which is well explained by assuming electron confinement in an infinite quantum well of size . Nanostripe finite size effects are more straightforwardly observed in Fermi surfaces, which are asymmetrically broadened in the perpendicular direction. This effect is quantitatively analyzed and explained as due to the characteristic spectral broadening observed in photoemission from -wide one-dimensional quantum wells.
- Received 13 July 2005
DOI:https://doi.org/10.1103/PhysRevB.72.195416
©2005 American Physical Society