Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.4: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Ferromagnetic topological insulators used as magnetic field sensors — •Matthias Borcherding and Thomas Dahm — Universität Bielefeld, Bielefeld, Germany

We investigate numerically the possibility of using ferromagnetic topological insulators to measure small changes in magnetic fields. For that, we calculate the intrinsic part of both the anomalous Hall and the spin Hall conductivity. Both the anomalous Hall effect and topological insulators are connected to the Berry curvature. We use a model for a three dimensional topological insulator and an effective two dimensional model. The latter is obtained from the first by applying a symmetric confining potential. We demonstrate conditions under which the sensitivity of such sensors becomes strongly increased.

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