Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 11: Elektronische Struktur (Experiment und Theorie) I

O 11.8: Vortrag

Montag, 8. März 2004, 17:30–17:45, H44

Structure and dynamics of ultra-thin Ag films on Au(111) — •Dunja Popović1, F. Forster1, V. Grigorian2, M. Springborg2, F. Reinert1, S. Hüfner1, H. Cercellier3, Y. Fagot-Revurat3, B. Kierren3, and D. Malterre31FR 7.2 Experimentalphysik, Universität des Saarlandes, 66041 Saarbrücken — 2FR 8.13 Physikalische Chemie, Universität des Saarlandes, 66041 Saarbrücken — 3Laboratoire de Physique des Matériaux, Université Henri Poincaré, Nancy I - B.P. 239 F-54506 Vandœuvre-lès-Nancy

Epitaxial Ag ultra-thin films grown on Au(111) have been studied by angle-resolved photoemission spectroscopy (ARPES). High resolution measurements on Au(111) reveal the splitting of the dispersive surface Shockley band in two spin-orbit contributions. Surface states corresponding to completed Ag monolayers are analysed with respect to their band minima and spin-orbit splitting and compared with the results of slab-layer band-structure calculations. Interdiffusion is found to play a significant role in the formation of the first monolayer. Moreover, it has been shown by ARPES that low deposition temperatures lead to poorly defined surface states of the overlayer, whereas scanning-tunneling microscopy revealed that post-annealed films grown at room temperature show no sharp interface but an alloy formation.

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