Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.81: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Manipulation of Rashba-split surface states in PbAg2/Ag(111) by rare-gas and alkali metal adsorption — •Arne Buchter1, Hendrik Bentmann1, and Friedrich Reinert1,2 — 1Universität Würzburg, Experimentelle Physik VII, Am Hubland, D-97074 Würzburg, Germany — 2Karlsruhe Institute of Technology, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany
Surface alloys like BiAg2 or PbAg2 show a huge Rashba-splitting in their 2D electronic structure. But unlike in the BiAg2-case the exact size of the splitting for the PbAg2-alloy is not yet clearly determined since in the latter case the spin-split bands are not fully occupied. Using angle-resolved photoelectron spectroscopy we studied the PbAg2 surface alloy after Xe adsorption and evaporation of alkali metals. Xe adsorbes in a 9x9 reconstruction [1] and backfolding of the electronic bands is clearly visible. Electron doping via adsorption of alkali metals (K, Cs) allows for a continuous band-shift towards higher binding energies [2]. The aim of our study is to gain further insight into the actual size of the splitting, the character of these electronic states and to tune the spin topology at the Fermi level.