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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.30: Poster
Freitag, 20. März 2020, 09:00–12:00, P2/EG
Photocurrents in 3D Topological insulators Hall bar and nanowire devices — •Nina Meyer1, Thomas Schumann1, Eva Schmoranzerová2, Kevin Geishendorf3, Gregor Mussler4, Jakob Walowski1, Petr Nemec2, Andy Thomas3, Kornelius Nielsch3, Detlev Grützmacher4, and Markus Münzenberg1 — 1Institute of Physics, University of Greifswald, Greifswald, Germany — 2Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — 3IFW Dresden, Institute for Metallic Materials, Dresden, Germany — 4Inst. for Semiconductor Nanoelectronics, PGI-9, Forschungszentrum Jülich, Germany
It has been demonstrated experimentally that illuminating a topological insulator (TI) with circular polarized light generates spin-polarized surface currents, since spin-momentum locking is present [1]. In this poster, we will sum up our results on photocurrent measurements on (Bi, Sb)2Te3 thin film Hall bar structures and Bi2Se3 core-shell nanowires. The laser light is moved in a 2D pattern across the sample surface and the photocurrent is measured as a function of the polarisation at every laser position. Therefore, the different contribution to the photocurrent can be displayed as spatially resolved 2D maps. For the Hall bar structure, a lateral accumulation of spin polarization at the TIs edges due to the spin Nernst effect is found [2]. For the nanowires, a constant spin polarized current far off the contacts is found and the edge effects of the Au/TI layer stack are investigated.
[1] J.W. McIver et al., Nature Nanotechnology 7, 96-100 (2012)
[2] T. Schumann et al., arXiv:1810.12799 (submitted)