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O: Fachverband Oberflächenphysik

O 8: Electronic Structure and Spin-Orbit Interaction I

O 8.8: Vortrag

Montag, 31. März 2014, 12:15–12:30, GER 38

Giant splitting of unoccupied surface resonant state on Tl/Si(111) — •Sebastian D. Stolwijk¹, Kazuyuki Sakamoto², Anke B. Schmidt¹, Peter Krüger³, and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität Münster — ²Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan — ³Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster

The Tl/Si(111)-(1× 1) surface features outstanding properties - a unique spin pattern in momentum space and an unoccupied surface state with giant spin splitting at the K point [1,2]. In this contribution, we focus on the unoccupied surface electronic structure along the ΓM direction. Spin- and angle-resolved inverse photoemission experiments with sensitivity to the in-plane and out-of-plane components of the spin polarization vector are conducted with the help of our recently developed ROtatable Spin-polarized Electron source (ROSE). Along ΓM only in-plane polarization is found. Moreover, we identify a spin-orbit-split surface resonant state, which exhibits a Rashba-type splitting. Remarkably, the size of the Rashba splitting is comparable to the giant splitting found for the Bi/Ag(111) surface [3].
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S. D. Stolwijk et al., Phys. Rev. Lett. 111, 176402 (2013)
C. Ast et al., Phys. Rev. Lett. 98, 186807, (2007)