Regensburg 2016 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 76: Frontiers of Electronic Structure Theory: Focus on Topology and Transport IV
HL 76.7: Talk
Thursday, March 10, 2016, 12:30–12:45, H24
Laser induced DC photocurrents in a Topological Insulator thin film — •Thomas Schumann1, Nina Meyer1, Gregor Mussler4, Eva Schmoranzerová2, Dagmar Butkovicova2, Helena Reichlová3, Lukas Braun5, Christian Franz6, Michael Czerner6, Pertr Němec2, Detlev Grützmacher4, Tobias Kampfrath5, Christian Heiliger6, and Markus Münzenberg1 — 1IfP, EMA University 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 are classified after [1,2] and we show that there are at least two signals visible, for example in time dynamics, which behave different in the suggested parameters.
We acknowledge the funding of the DFG via the SPP 1666 Topological Insulators and the joint DAAD PPP Czech Republic project FemtomagTopo. [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)