Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Spintronics (incl. quantum dynamics) (Joint session of HL, MA and TT, organized by MA)

HL 52.3: Talk

Wednesday, March 9, 2016, 10:00–10:15, H32

Spin Mapping of Surface and Bulk Rashba States in Ferroelectric α-GeTe(111) Films — •H. J. Elmers¹, R. Wallauer¹, M. Liebmann², J. Kellner², M. Morgenstern², R.N. Wang³, J.E. Boschker³, R. Calarco³, O. Rader⁴, D. Kutnyakhov¹, S.V. Chernov¹, K. Medjanik¹, C. Tusche⁵, M. Ellguth⁵, H. Volfova⁶, J. Braun⁶, J. Minar⁶, H. Ebert⁶, and G. Schönhense¹ — ¹Institut für Physik, Johannes Gutenberg-Universität Mainz — ²II. Physikalisches Institut B and JARA-FIT, RWTH Aachen — ³Paul-Drude-Institut für Festkörperelektronik, Berlin — ⁴Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin — ⁵Max Planck Institute for Microstructure Physics, Halle — ⁶Department Chemie, Ludwig-Maximilians-Universität München

Ferroelectric semiconductors like GeTe promise a switchable Rashba-parameter for electronic bulk states. A comprehensive mapping of the spin polarization of the electronic bands in α-GeTe(111) films has been performed using a time-of-flight momentum microscope equipped with an imaging spin filter that enables a simultaneous measurement of more than 10.000 data points. In addition to the Rashba type splitting of surface bands we observe a spin splitting of bulk bands with opposite spin helicity of the inner and outer Rashba bands revealing the complex spin texture at the Fermi energy that determines electronic transport.