Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Electronic structure of Surfaces: Magnetism and Spin Phenomena
MA 30.4: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1A
Laser induced photocurrents in a Topological Insulator thin film analyzed by 2D maps for VIS and NIR — •Thomas Schumann1, Helena Reichlová3, Gregor Mussler4, Eva Schmoranzerová2, Pertr Němec2, Tobias Kampfrath5, Christian Heiliger6, and Markus Münzenberg1 — 1IfP, University of Greifswald, Germany — 2MFF, Charles University, Prague, Czech Republic — 3FZU, Prague, Czech Republic — 4PGI-9, Jülich, Germany — 5FHI Berlin, Germany — 6University of Gießen, Germany
Topological Insulators (TI) open up a new route to influence the transport of charge and spin in a surface film via spin-momentum locking [1,2]. It has been demonstrated experimentally [2] that illumination by circularly polarized light can result in excitation of a helicity-dependent photocurrent. We report our recent results on laser induced photocurrents in a terniary 3D TI thin film. The resulting photocurrents have been studied by 2D photocurrent maps for different dopings and for VIS to NIR laser excitation. We although discuss the effects of contacts and edges if they are illuminated by the laser.
[1]S.D.Ganichev,W.Prettl,J.Phys.: Condens. Matter 15 (2003) R935-R983
[2]J.W.McIver,D.Hsieh,H.Steinberg,P.Jarillo-Herrero and N.Gedik, Nature Nanotechnology 7, 96-100 (2012)
We acknowledge the funding of the DFG via the SPP 1666 Topological Insulators and the joint DAAD PPP Czech Republic project FemtomagTopo.