Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.36: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

ROSE: ROtatable Spin-polarized Electron source — •Sebastian D. Stolwijk, Henry Wortelen, Anke B. Schmidt, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster

Surfaces of non-magnetic materials may exhibit surface states with complex spin structures in reciprocal space. To understand the fundamental mechanisms of the underlying effects, it is crucial to obtain as complete information as possible on the polarization of the electronic states. So far, current spin- and angle-resolved inverse photoemission experiments are limited to one polarization direction. Here, we introduce a recently developed ROtatable Spin-polarized Electron source (ROSE). Briefly, this is based on a GaAs spin-polarized electron source, which is modified by embedding a variable rotation of the source chamber. It produces a transversally spin-polarized electron beam, whose polarization direction lies either in the plane of incidence or is perpendicular to it. With ROSE, the inverse photoemission experiment is sensitive to at least two in-plane polarization directions. Furthermore, by rotating the sample, one gains sensitivity to the out-of-plane component. In-situ measurements of the unoccupied electronic structure of Tl/Si(111) demonstrate the beauty of the ROSE.