Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 32: Surface Magnetism and Spin Phenomena

O 32.3: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Spin-polarized surface electronic structure of Ta(110) and W(110): Similar, yet different — •Bernd Engelkamp¹, Hossein Mirhosseini², Henry Wortelen¹, Anke Schmidt¹, Jürgen Henk³, and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany — ²Institut für Anorganische Chemie und Analytische Chemie, 55122 Mainz, Germany — ³Institut für Physik, Martin Luther-Universität Halle-Wittenberg, 06120 Halle, Germany

For Ta(110) and W(110), a very similar surface electronic structure is expected. One remarkable feature on W(110) is a spin-polarized, Dirac-cone-like occupied surface state with a spin texture, which is reminiscent of topological surface states [1], [2]. Due to the lack of one electron in tantalum compared with tungsten this surface state is expected above the Fermi level for Ta(110).

In this poster, we present a spin- and angle-resolved inverse photoemission study of Ta(110) in combination with spectral-density calculations. Surprisingly, we could not identify a Dirac-cone-like surface state on Ta(110), but instead a spin-split unoccupied surface state. The similarities and differences between the surface electronic structure of W(110) and Ta(110) will be discussed.

[1] K Miyamoto et al. Phys. Rev. Lett. 108, 066808 (2012)

[2] H Mirhosseini et al. New J. Phys. 15, 033019 (2013)