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Berlin 2012 – wissenschaftliches Programm

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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 35.42: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Spin-resolved photoemission experiments of Rashba-split quantum-well electron states — •Sebastian Jakobs1,2, Andreas Ruffing1, Sabine Steil1, Indranil Sarkar1, Stefan Mathias1, Mirko Cinchetti1, and Martin Aeschlimann11Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, University of Kaiserslautern, D-67663 Kaiserslautern, Germany

The Rashba-Bychkov effect in a two-dimensional electron gas originates from spin-orbit interaction and an asymmetric confinement of the electron gas. It can produce spin-split energy bands in nonmagnetic materials without the need of applying any external magnetic field. This effect has been shown on various surfaces, and the resulting spin-split surface-state bands show a high spin polarization directed in the surface plane, perpendicularly to the k-vector of the photoelectrons [1]. Recently, we reported on the observation of a giant Rashba spin-orbit splitting of quantum-well state bands in the unoccupied electronic structure of a Bi monolayer on Cu(111) [2]. In this poster we will present first spin-resolved photoemission experiments of both commensurate and incommensurate structure of the quantum-well system Bi/Cu(111), which confirm the Rashba-character of the splitting.
[1] J.H. Dil, J. Phys.: Condens. Matter 21, 403001 (2009)

[2] S. Mathias et al., Phys. Rev. Lett. 104, 066802 (2010)

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