Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 48: Electronic Structure: Surface Magnetism and Spin Phenomena
O 48.6: Poster
Tuesday, March 8, 2016, 18:15–20:30, Poster E
Bi/Ag(111) vs. Pb/Ag(111) along Γ M and Γ K – A comparative study of the unoccupied states — •Katharina T. Ritter1, Sune N. P. Wissing1, Anke B. Schmidt1, Hossein Mirhosseini2, Steven Achilles3, Jürgen Henk3, and Markus Donath1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 3Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Germany
Surface alloys of heavy metal elements on noble metal surfaces exhibit strongly Rashba-split band structures. Especially surface alloys with (√3×√3)R30∘ reconstruction have been investigated over the last few years.
Here, we compare Bi/Ag(111) and Pb/Ag(111) systematically. We present spin- and angle-resolved inverse photoemission data for both high-symmetry directions Γ M and Γ K. The experimental data is complemented by theoretical calculations.
Changing the adsorbate from Bi to Pb results in an energetic shift of the surface states and leads to a different size of the spin splitting. These changes are attributed to the adsorbate’s atomic number, which is connected to the atomic spin-orbit coupling, as well as to its size, thus the relaxation of the surface.