Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 80: Poster: Scanning Probe Techniques - Method Development

O 80.7: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Detection of spin-polarized transport in topological insulators using a 4-tip STM — •Arthur Leis, Sven Just, Vasily Cherepanov, and Bert Voigtländer — Peter Grünberg Institut (PGI-3) and JARA-FIT, Forschungszentrum Jülich, Germany

Spin-momentum locked surface states as a hallmark of topological insulators are of particular interest in solid-state physics. However, the detection of these states in transport measurements is a challenge, as a spin-sensitive measurement technique is needed. While most measurement efforts are based on optical methods, reports on the electrical detection of spin-polarized charge transport are still scarce and include lithographic sample preparation. Our approach to this challenge is an in-situ distance-dependent four-point probe measurement technique using a multi-tip STM with magnetic tips. While distance-dependent measurements are used for the distinction between 2D- and 3D-transport, using magnetic tips allows for the detection of spin-polarization.