Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 57: Topological Insulators II
(Joint session of DS and HL, organized by HL)

DS 57.5: Talk

Friday, March 11, 2016, 11:00–11:15, H15

Optoelectronic dynamics in nanocircuits based on the topological insulator Bi2Te2Se — •Mariana Hettich¹, Paul Seifert¹, Christoph Kastl¹, Kristina Vaklinova², Marko Burghard², and Alexander Holleitner¹ — ¹Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4a, D-85748 Garching, Germany — ²Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

We report on the optoelectronic dynamics in nanocircuits made of the topological insulator Bi2Te2Se. An on-chip photocurrent pump-probe spectroscopy based on coplanar striplines allows us to identify the different ultrafast photocurrent mechanisms in topological insulators with a picosecond time resolution. We discuss non-equilibrium thermal effects as well as the circular photogalvanic current generation as contributions to the overall photocurrent.