Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Electronic Structure of Surfaces: Magnetism and Spin Phenomena II

O 14.4: Vortrag

Montag, 20. März 2017, 15:45–16:00, WIL C107

Spin texture manipulation in the multiferroic Rashba semiconductor GeMn_xTe — Juraj Krempasky¹, Stefan Muff^1,2, Jan Minar³, Nicolas Pilet¹, Peter Warnicke¹, Vladimir Strocov¹, Gunther Springholz⁴, and •Hugo Dil^1,2 — ¹Swiss Light Source, Paul Scherrer Institut, Switzerland — ²Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, Switzerland — ³Department of Chemistry, Ludwig Maximillian Universität, Germany — ⁴Institut für Halbleiter-und Festkörperphysik, Johannes Kepler Universität, Austria

The search for materials with novel functional spin properties has received a prominent place in modern condensed matter physics because of the promise they bear in spinorbitronics and topological quantum phenomena. Multiferroic Rashba semiconductors are expected play an important role in this aspect because they combine a large Rashba-type spin splitting and ferromagnetic order in a manipulatable environment. By using a combination of spectroscopic techniques we could determine the electronic structure and spin properties of Mn-doped GeTe thin films[1,2]. The 3D Fermi surface takes the shape of a gapped spindle torus with just one spin-polarised Fermi sheet. Furthermore, it will be shown that the spin properties can be manipulated by either an electric field, a magnetic field, or optical stimuli. The films remain superconducting even after Mn doping, thus providing all the ingredients for the formation and manipulation of Majorana fermions.

[1,2] J. Krempasky et al. PRB 94, 205111 (2016); J. Krempasky et al. Nature Commun. 7, 13071 (2016).