DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2012 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.85: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster B

Surface and Image-Potential States of Ni(111) Investigated with Spin- and Time-Resolved 2PPEThomas Odebrecht1,2, •Beatrice Andres1,2, Marko Wietstruk1,2, Anke B. Schmidt3, Markus Donath3, and Martin Weinelt1,21Max-Born-Institut, 12489 Berlin — 2Fachbereich Physik, Freie Universität Berlin, 14195 Berlin — 3Physikalisches Institut, Westfälische Wilhelms-Universität Münster, 48149 Münster

The surface electronic structure of Ni(111) does not only exhibit occupied sp- and d-derived bulk states and surface resonances [1], but also a partially occupied Shockley-like surface state (SSS) as well as a Rydberg-series of image-potential states (IPS) close to the vacuum enegy. In two-photon photoemission experiments (2PPE) using the fundamental (1hν=1.6 eV) and the third harmonic (3hν = 4.8 eV) of our Ti:Sa laser, we gain information on exchange splitting, spin polarization and spin-dependent lifetimes of these states.
We can either populate the unoccupied minority component of the SSS with a 1hν pulse and probe with 3hν or use a 3hν-pump and 1hν-probe pulse to reach the energetic region of the IPS. Populating the IPS out of the occupied components of the surface and bulk states we create a spin-polarized population in these unoccupied states which allows us to study their spin-dependent properties.

[1] Okuda et. al., Phys. Rev. B 80, 180404 (2009).

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2012 > Berlin