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TT: Fachverband Tiefe Temperaturen
TT 13: Topological Insulators: Mostly Structure and Electronic Structure (organized by HL)
TT 13.7: Talk
Monday, March 31, 2014, 11:15–11:30, POT 051
Optoelectronic flow trajectories in topological insulators — •Paul Seifert1, Christoph Kastl1, Tong Guan2, Kehui Wu2, X. Y. He2, Yongqing Li2, and Alexander W. Holleitner1 — 1Walter Schottky Institut and Physik-Department, Technische Universität München — 2Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
We report on the optoelectronic properties of thin films of the topological insulator (BixSb1−x)2Te3 grown by molecular beam epitaxy. In spatially resolved experiments, we observe photocurrent patterns with positive and negative amplitude [1]. We interpret the patterns to originate from a local photocurrent generation due to potential fluctuations [1]. Exploiting the local photocurrent generation in combination with a sub 100-nm lithography, we visualize the current flow in nanoscale circuits based on topological insulators [2].
[1] C. Kastl, T. Guan, X. Y. He, K. H. Wu, Y. Q. Li, and A. W. Holleitner, Appl. Phys. Lett. 101, 251110 (2012). [2] C. Kastl et al., (2014).
We gratefully acknowledge financial support from the DFG-project HO3324/8 within the SPP 1666 on topological insulators.