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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.3: Poster

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

The Meservey-Tedrow technique applied to surface states of topological insulators — •Matthias Götte and Thomas Dahm — Universität Bielefeld, Bielefeld, Germany

The spin polarization of topological surface states is commonly measured by spin and angle resolved photoemission spectroscopy (SARPES), however with some ambiguities. As the spin polarization can be an important quantity for the efficiency of topological insulator materials in spintronic applications, we theoretically investigate an alternative technique.

The so called Meservey-Tedrow technique is based on spin dependent tunneling from a superconducting electrode and is an established technique for measuring the polarization of ferromagnets. Here, we show that it can be adapted to topological insulators to determine the in-plane component of the surface state spin polarization as well as the spin-flip scattering rate of surface electrons.