Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Electronic Structure and Spin-Orbit Interaction II
O 16.12: Vortrag
Montag, 31. März 2014, 18:45–19:00, GER 38
Spin-split surface state above the Fermi level on Ta(110) — •Bernd Engelkamp1, Henry Wortelen1, Jürgen Henk2, Anke B. Schmidt1, and Markus Donath1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany
Recent experimental and theoretical photoemission studies on W(110) have been focused on a spin-polarized Dirac-cone-like surface state within a spin-orbit-induced symmetry gap [1, 2]. Browsing the periodic table for another heavy element with bcc structure yields only tantalum. On Ta(110), with one valence electron less compared to W(110), the spin-orbit-induced symmetry gap is expected above the Fermi level.
Using spin- and angle-resolved inverse photoemission we identified a spin-split surface state along the Γ-H direction. We present our experimental results in combination with spectral density calculations in both high-symmetry directions Γ-H and Γ-N.
[1] K Miyamoto et al. Phys. Rev. Lett. 108, 066808 (2012)
[2] H Mirhosseini et al. New J. Phys. 15, 033019 (2013)