Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.81: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

Spin-resolved Inverse Photoemission on Rashba-Systems — •Sune Wissing, Christian Eibl, Anke B. Schmidt, and Markus Donath — Physikalisches Institut, Westfaelische Wilhelms-Universitaet, Wilhelm-Klemm-Str. 10, 48149 Muenster, Germany

The possibility to create spin currents without using external magnetic fields could result in useful applications to spintronics. Therefore, the discovery of the spin-orbit splitting on a Au(111) surface by LaShell et al. [1] gave rise of a highly interesting and rapidly growing field of research. Many different systems have been investigated by using angle-resolved photoemission in order to find a ”giant“ Rashba splitting. Yet it was not possible to follow the splitting of the dispersion within the Brillouin zone above the Fermi level.

We present an experimental setup for spin and angle-resolved inverse photoemission for measurement of the Rashba spin splitting in the unoccupied states. In order to observe a Rashba splitting, it is necessary that the in plane wave vector of the electrons is perpendicular to their spin-quantization axis. Therefore we turned our spin-polarized electron source by 90 degrees with the result that the spin-quantization axis is parallel to the rotation axis of our sample. By measuring the Cu(111) L-gap surface state we can show that the angle and energy resolution of our experiment conforms to the requirements for measuring the Rashba splitting.

[1] S. LaShell et al.: Phys. Rev. Lett. 77, 3419 (1996)