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MA: Fachverband Magnetismus

MA 22: Surface Magnetism (Joint Session with O)

MA 22.9: Vortrag

Dienstag, 21. März 2017, 12:00–12:15, HSZ 401

Hosting of spin polarized surface states in spin-orbit induced bulk band gaps of W — •Hans-Joachim Elmers¹, Dmitro Kutnyakhov^1,3, Sergej V. Chernov¹, Katerina Medjanik¹, Olena Fedchenko¹, Anna Zaporozhchenko-Zymaková¹, Martin Ellguth¹, Christian Tusche², Jens Viefhaus³, and Gerd Schönhense¹ — ¹Universität Mainz — ²FZ Jülich — ³DESY Hamburg

Spin momentum locking of surface states has attracted great interest due to potential applications in spintronics. Normal metal surfaces like W(110) and Ir(111) show surface states with energy dispersions and spin-polarization structures, which are reminiscent of topological surface states. In order to understand this phenomenon the connection of bulk and surfaces states has to be explored. Using time-of-flight momentum microscopy [1], we measured bulk bands with soft X-ray excitation within the first 3D Brillouin zone. Surface states are determined by the same method at low photon energy. The comparison of the results reveals the hosting of surface states within the gap topology of bulk bands projected on the surface Brillouin zone. [1] D. Kutnyakhov et al., Sci. Rep. 6, 29394 (2016).