Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Electronic Structure and Spin-Orbit Interaction I

O 8.9: Vortrag

Montag, 31. März 2014, 12:30–12:45, GER 38

Spin-split surface states in the unoccupied electronic structure of Tl/Ge(111)-(1x1) — •Philipp Eickholt¹, Sebastian D. Stolwijk¹, Anke B. Schmidt¹, Peter Krüger², and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms Universität, Münster, Germany — ²Institut für Festkörpertheorie, Westfälische Wilhelms Universität, Münster, Germany

The unoccupied electronic structure of Tl/Si(111)-(1x1) exhibits a unique spin-orbit-split surface state with rotating polarization vector and giant energy splitting at the K point [1]. Here, we present spin- and angle-resolved inverse-photoemission results on the unoccupied electronic structure of the isoelectronic Tl/Ge(111)-(1x1) surface, which is expected to show similar properties [2]. In fact, along the ΓK direction, a similar spin-orbit-split surface state is found with comparable properties as observed on Tl/Si(111). Differences between the two surfaces can be seen along ΓM, where a Rashba-type spin-split surface state on the Tl/Ge(111) surface lies well within a band gap, while it is degenerate with the bulk bands on the Si substrate. Remarkably, our measurements feature a spin asymmetry directly at the M point where spin degeneracy should prevail.
Sebastian D. Stolwijk et al., Phys. Rev. Lett. 111, 176402 (2013)
Y. Ohtsubo et al., J.Phys.: Condens. Matter 24, 092001 (2012)