SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Poster: Superconductivity II

TT 58.28: Poster

Donnerstag, 30. März 2023, 15:00–18:00, P2/OG3

Cyclotron resonance on germanium probed by coplanar microwave resonators — •Anastasia Bauernfeind, Frederik Bolle, Martin Dressel, and Marc Scheffler — 1. Physikalisches Institut, University of Stuttgart, Stuttgart, Germany

Cyclotron resonance is a powerful way to investigate the Fermi surface of various materials. In our research we performed cyclotron resonance experiments on the semiconductor germanium by using metallic coplanar waveguides (CPW). In comparison to conventional three-dimensional cavity resonators, CPW resonators have the advantage of multiple well-accessible resonances. Furthermore, CPWs open the possibility of implementation in a dilution refrigerator, which makes the performance down to the mK regime possible, which is also interesting for Kondo insulators. By using a superconducting magnet (up to 8T) and the access to a broad frequency range in the microwave regime (up to 25 GHz), we were able to investigate the cyclotron resonance in germanium in detail. Here we analysed the frequency-, temperature- (2-40K) and power dependence of the cyclotron resonance signal. Beside the investigation of the electronic bands, we present interesting phenomena like the generation of charge carriers by the power of the microwave electric field and the process of impact ionization in p-doped germanium.