Regensburg 2004 – scientific programme
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MA: Magnetismus
MA 4: Oberfl
ächenmagnetismus
MA 4.10: Talk
Monday, March 8, 2004, 12:30–12:45, H22
Rashba splitting of surface states at Gd(0001) surfaces — •G. Bihlmayer1, O. Krupin2, J.E. Prieto2, S. Blügel1, G. Kaindl2, and K. Starke2 — 1Institut für Festkörperforschung, Forschungszentrum Jülich, Germany — 2Fachbereich Physik, Freie Universität Berlin, Germany
By angle resolved photoemission measurements on clean and O-covered Gd(0001) surfaces a dependence of the dispersion of the surface state on the magnetization direction of the sample was found. We present results of first-principles calculations showing that this behavior is a direct manifestation of a relativistic effect, known as Rashba effect in the field of semiconductor heterostructures. Normally, this tiny effect is difficult to observe directly or to access with ab-inito calculations, but on some metal surfaces it is large; we discuss, why the strength of this ’spin-orbit splitting’ is big for some states (O/Gd(0001)) and rather small for others (clean Gd(0001)). Our results are in good quantitative agreement with measured data. The differences to the nonmagnetic surfaces, on which this effect also has been observed (e.g. Au(111)) are addressed. Other systems, on which this effect could be observed experimentally are suggested.