Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 8: Electronic Structure and Spin-Orbit Interaction I
O 8.1: Talk
Monday, March 31, 2014, 10:30–10:45, GER 38
Depending on how you look at it - (un)conventional spin topology in the unoccupied band structure of Bi/Ag(111) — •Sune N. P. Wissing1, Anke B. Schmidt1, Christian R. Ast2, Hossein Mirhosseini3, Jürgen Henk4, and Markus Donath1 — 1Westfälische Wilhelms-Universität Münster, Germany — 2Max-Planck-Institut für Festkörperforschung Stuttgart, Germany — 3Johannes Gutenberg-Universität Mainz, Germany — 4Martin-Luther-Universität Halle-Wittenberg, Germany
We report on the challenge to determine the spin of the electronic structure out of a spin-polarized (inverse) photoemission experiment. For this purpose, we present a study on the unoccupied electronic structure of Bi/Ag(111) with spin- and angle-resolved inverse photoemission. Above the Fermi level, we identify several states with distinct spin character.
We focus our attention on the two pxy-derived surface states. For the downward dispersing mj=1/2 state, theoretical calculations [1] predict a complex spin topology, where the spin polarization changes sign at the band maximum. Our experimental findings, however, indicate a spin splitting compatible with the conventional Rashba model. To shed more light on this issue, we investigated the spin topology with the help of first-principles electronic-structure and photoemission calculations. We will discuss the dependence of the measured spin topology on the polarization of the emitted light and the symmetry of the involved electronic states.
[1] G. Bihlmayer et al., Phys. Rev. B 75, 195414 (2007)