Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 49: Electronic structure IV

O 49.4: Vortrag

Freitag, 31. März 2006, 12:00–12:15, WIL B321

Electronic Structure of the (2×3)–N/Cu(110) Surface — •Peter Lendecke, Tobias Allmers, Georgi Rangelov, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Sputtering a Cu(110) surface with nitrogen and subsequent annealing induces a (2×3) reconstruction. The copper atoms in the topmost layer are arranged in a nearly square array formed by additional [110]–rows. Nitrogen atoms are bonded in almost every second hollow site of this strongly corrugated pseudo–(100) layer [1].
We investigated the unoccupied electronic structure of this reconstructed surface by angle–resolved inverse photoemission. Preparation of the reconstruction was controlled by LEED and in–situ STM. Inverse photoemission spectra are dominated by Cu(110) bulk transitions. The reduced surface Brillouin zone along [001] is reflected by surface umklapp processes. Unoccupied surface states of Cu(110) are already quenched at low nitrogen doses. The reappearance of a surface resonance along [110] in the high–dose regime is most probably due to improved long–range order of the surface.

[1] S. Moré et al., Surf. Sci. 381, L589 (1997)