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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.7: Poster

Thursday, March 19, 2020, 15:00–19:00, P2/EG

Mobility spectrum analysis on the topological insulator BiSbTeSe2 — •Jimin Wang1, Alexander Kurzendorfer1, Lin Chen1, Zhiwei Wang2, Yoichi Ando2, Yang Xu3, Ireneusz Miotkowski3, Yong P. Chen3, and Dieter Weiss11Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany — 2Physics Institute II, University of Cologne, Zülpicher Str. 77, 50937 Köln, Germany — 3Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA

We conducted mobility spectrum analysis on high quality 3D topological insulator BiSbTeSe2 to extract mobility µ, and carrier density n. Top and bottom gates were applied to tune the carrier density independently on top and bottom surfaces. At 1.5 K, when the conduction is almost entirely dominated by the Dirac surface states, we always find two dominant conduction channels (top and bottom surfaces), with µ = 1000−3000 cm2/Vs, and n on the order of 1012 cm−2. However, at sufficiently high temperature (T= 85 K), when the bulk contributes, a third channel opens (µ ∼ 200 cm2/Vs, and n∼1012 cm−2). Our analysis shows the feasibility of the method, which is also promising for similar material systems.

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