Dresden 2003 – wissenschaftliches Programm
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O: Oberflächenphysik
O 34: Elektronische Struktur IV
O 34.4: Vortrag
Donnerstag, 27. März 2003, 15:45–16:00, M\"UL/ELCH
Surface states at Ag/Cu(335) striped nanostructures — •J. Kuntze1, A. Mugarza2, J. Crain3, F. J. Himpsel3, and J. E. Ortega2 — 1Institut für Experimentelle und Angewandte Physik der Universität Kiel, D-24098 Kiel, Germany — 2Universidad del País Vasco, Dpto. de Física Aplicada I, Donostia International Physics Center, and Centro Mixto CSIC/UPV, E-20018 San Sebastián, Spain — 3Physics Department, University of Wisconsin Madison, Madison, Wisconsin 53706-1390, USA
By Ag adsorption, vicinal Cu(335) undergoes a faceting transition similar to the recently reported Ag/Cu(223) system [1], exhibiting a periodic array of Ag covered (112) oriented facets and bare Cu stripes. By tuning the Ag coverage, the Ag/Cu stripe width and hence the periodicity of the array can be controlled.
We use angle resolved photoemission and synchrotron radiation to study the electronic structure of the faceted system. The spectra are dominated by surface states from Cu stepped stripes, which display umklapp bands from the local step array. The split of the umklapp features in the Fermi surfaces reduces as the Ag coverage is increased, consistent with a change in local slope of the corresponding bare Cu stripes. Above a coverage of 0.6 ML, the Cu surface state becomes quasi one-dimensional due to confinement in the direction perpendicular to the step array.
[1] A. R. Bachmann, A. Mugarza, J. E. Ortega, and S. Speller Phys. Rev. B 64, 153409 (2001)