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SYES: Symposium Frontiers of Electronic Structure Theory: Focus on Topology and Transport

SYES 6: Frontiers of Electronic Structure Theory: Focus on Topology and Transport IV

SYES 6.7: Vortrag

Donnerstag, 10. März 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)