Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Surface State Spectroscopy II
O 16.8: Vortrag
Montag, 7. März 2016, 16:45–17:00, H4
Effects of orbital composition in a pair of spin-orbit-split surface bands at Tl/Ge(111) — •Ph. Eickholt1, P. Krüger2, S.D. Stolwijk1, A.B. Schmidt1, and M. Donath1 — 1Physikalisches Institut, Universität Münster, Germany — 2Institut für Festkörpertheorie, Universität Münster, Germany
Surface states of the Tl/Si(111)-(1×1) [1-3] and Tl/Ge(111)-(1×1) surfaces are strongly influenced by spin-orbit-interaction (SOI), leading to peculiar spin textures. Our setup for spin- and angle-resolved inverse photoemission allows us to study the unoccupied spin-orbit-split surface states within the whole Brillouin zone. In general, the surface electronic structures of both systems are very similar. In particular, surface states with comparable properties are found along Γ K, independent of the substrate. Close to the M point, however, the spin splitting between a pair of surface states at Tl/Ge(111)-(1×1) is considerably smaller than the splitting of the equivalent surface resonances at Tl/Si(111)-(1×1) – despite the fact that the former ones are more localized at the heavy Tl atoms. The difference in spin splitting is counter-intuitive since SOI in these systems is mainly due to the heavy Tl atoms and, in addition, Ge is heavier than Si. In this talk, we will show that a peculiar combination of SOI and hybridization [4] gives rise to the surprising differences observed in the experiment.
[1] S.D. Stolwijk et al., Phys. Rev. Lett. 111, 176402 (2013)
[2] S.D. Stolwijk et al., Phys. Rev. B 90, 161109(R) (2014)
[3] S.D. Stolwijk et al., Phys. Rev. B 91, 245420 (2015)
[4] S.N.P. Wissing et al., Phys. Rev. B 91, 201403(R) (2015)