Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Electronic Structure and Spin-Orbit Interaction II
O 55.6: Vortrag
Mittwoch, 13. März 2013, 17:15–17:30, H42
Bi/Ag(111) - A ”Bird’s Eye View” - Spin-resolved Band Structure above the Fermi Level — •Sune N. P. Wissing1, Anke B. Schmidt1, Fabian Zinser2, Klaus Kern2, Christian R. Ast2, and Markus Donath1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Germany — 2Max-Planck-Institut für Festkörperforschung Stuttgart, Germany
We studied the unoccupied electronic structure of the surface alloy Bi/Ag(111) (√3×√3) R30∘ with scanning tunneling spectroscopy and spin- and angle-resolved inverse photoemission. The adsorption of heavy elements on noble-metal surfaces results in surface alloys, which exhibit surface states with large Rashba-type spin splittings. Detailed information about the occupied electronic structure is available from various angle-resolved photoemission studies. Above the Fermi level, we have identified several unoccupied states with significant spin dependence. We determined their nature regarding symmetry and bulk vs. surface character as well as their energy vs. momentum dispersion and their spin dependence. We will discuss our results in the light of theoretical calculations [1].
[1] G. Bihlmayer et al., PRB 75, 195414 (2007)