Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 5: Spin-Orbit Interaction at Surfaces I
O 5.5: Vortrag
Montag, 14. März 2011, 12:15–12:30, WIL B321
Spin-resolved measurements of the Rashba-split surface state on Au(111) above the Fermi level — Sune N. P. Wissing1, •Anna Zumbülte1, Christian Eibl1, Anke B. Schmidt1, Jürgen Braun2, and Markus Donath1 — 1Physikalisches Institut, Westfaelische Wilhelms-Universitaet, Wilhelm-Klemm-Str. 10, 48149 Muenster, Germany — 2Dept. Chemie und Biochemie, LMU München, Germany
We report on the first spin-resolved measurement of an unoccupied Rashba-split surface state via inverse photoemission.
Since the discovery of the spin-orbit splitting on a Au(111) surface by LaShell et al. [1] in 1996, many different systems have been investigated for a better understanding of Rashba-type phenomena. Yet it was not possible to expand the present information by spin-resolved measurements above the Fermi level.
Spin and angle-resolved inverse photoemission is a powerful tool to determine the unoccupied electronic structure of solid surfaces and thin films. In order to demonstrate the potential of this method for investigating interesting Rashba phenomena, we present measurements of the prototype Rashba system: the Au(111) surface. We were able to confirm the Rashba splitting of the surface state as it continues above the Fermi level. Moreover, we investigated its behaviour when the surface state becomes degenerate with bulk states.
[1] S. LaShell et al.: Phys. Rev. Lett. 77, 3419 (1996)