Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Electronic Structure and Spin-Orbit Interaction I

O 8.4: Vortrag

Montag, 31. März 2014, 11:15–11:30, GER 38

The Unoccupied Band Structure of Pb/Ag(111) — •Katharina T. Ritter, Sune N. P. Wissing, Anke B. Schmidt, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Germany

Surface alloys of heavy elements on noble metal fcc(111) surfaces are known to exhibit strongly Rashba-split band structures. Especially the surface alloys with (√3×√3)R30^∘ reconstruction have been in the focus of theoretical and experimental reasearch. So far, most experimental data result from photoemission experiments and hence are limited to the occuppied electronic states.

Here, we perform spin- and angle-resolved inverse photoemission to access the unoccupied band structure of Pb/Ag(111). Above the Fermi level, we identify several states with distinct spin dependence. We determine their nature concerning symmetry, bulk vs. surface character, energy vs. momentum dispersion, and spin character. As we recently also investigated the related surface alloy Bi/Ag(111), we will compare the results of both systems and analyse systematic changes accompanying the reduction of the number of valence electrons of the adsorbate by one.