Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: Electronic Structure: Surface Magnetism and Spin Phenomena

O 48.6: Poster

Dienstag, 8. März 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.