Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Electronic Structure: Surface Magnetism and Spin Phenomena

O 88.9: Vortrag

Donnerstag, 19. März 2015, 17:00–17:15, MA 042

Rashba Splitting of d_z² Surface State on Ta(110) — •Henry Wortelen¹, Koji Miyamoto¹, Hossein Mirhosseini², Taichi Okuda³, Jürgen Henk⁴, and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität Münster — ²Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz — ³Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan — ⁴Institut für Physik, Martin-Luther-Universität Halle-Wittenberg

The influence of spin-orbit effects on the surface electronic structure of Ta(110) was investigated by high-resolution spin- and angle-resolved photoemission. We will present photoemission data obtained by excitation with s- and p-polarized light to reveal the orbital character of the states.

A surface state with d_z² symmetry [1] was detected at a binding energy of 0.45 eV at Γ. It shows a Rashba-type spin splitting, which is large compared with d_z² surface states of other elements of the same period such as Gd(0001) [2] and Tb(0001) [3]. We will discuss our experimental results in the context of electronic-structure calculations concerning spin-dependent spectral densities, spin-dependent photoelectron intensities, and symmetries of the observed states.

[1] E. Kneedler et al., Phys. Rev. Lett. 64, 3151 (1990)

[2] O. Krupin et al., Phys. Rev. B 71, 201403 (2005)

[3] O. Krupin et al., New J. Phys. 11, 013035 (2009)