Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Spin-Orbit Interaction at Surfaces II
O 32.5: Vortrag
Dienstag, 15. März 2011, 12:15–12:30, WIL C307
Spin-resolved photoemission experiments of Rashba-split quantum-well electron states — •Sebastian Jakobs1, Andreas Ruffing1, Sabine Steil1, Indranil Sarkar1, Mirko Cinchetti1, Stefan Mathias1,2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2JILA and Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA
The Rashba-Bychkov effect in a 2D electron gas, which originates from spin-orbit interaction and an asymmetric confinement of the electron gas, can produce spin-split energy bands in nonmagnetic materials without the need to apply any external magnetic field. The effect has been shown on various surfaces, and the resulting spin-split surface-state bands show a high spin polarization in the in-plane direction and perpendicular to the k-vector of the photoelectrons [1]. Recently, we reported on the observation of such a giant Rashba spin-orbit splitting of quantum-well state bands in the unoccupied electronic structure of a Bi monolayer on Cu(111) [2]. Due to an asymmetry in the alignment of the Bi-atoms in the incommensurate structure an additional out-of-plane spin component is to be expected. In this talk we will present first spin-dependent photoemission experiments on the one monolayer Bi/Cu(111) system, which confirm the expected out-of-plane spin component of the split quantum-well electron bands.
J.H. Dil, J. Phys.: Condens. Matter 21, 403001 (2009)
S. Mathias et al., Phys. Rev. Lett. 104, 066802 (2010)