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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.40: Poster

Thursday, March 19, 2015, 15:00–18:00, Poster B

THz magneto-optics and FIR spectroscopy on topological insulators — •Nick Borgwardt1, Gregor Mussler2, Malte Langenbach1, Joachim Hemberger1, and Markus Grüninger111 II. Physikalisches Institut, Universität zu Köln, Cologne, Germany — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany

Topological insulators are one of the most discussed areas of current research in condensed matter physics. Topological insulators show outstanding electromagnetic properties. One example is the Faraday rotation angle, which in the quantum Hall state is expected to be given by the fine structure constant. We report on optical data in the THz and FIR range measured on thin films of (Bi,Sb)2Te3 grown on high-resistive Si (111) wafers by MBE. For magneto-optical measurements in the THz range, we employ two photomixers placed inside a magneto-cryostat with magnetic fields B of up to 8T. Phase-sensitive detection of circularly polarized light allows for a direct determination of the Faraday rotation angle without any mechanically moving components in the THz path. We studied the transmittance and phase change as a function of temperature and magnetic field for thin films of various thicknesses.

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