SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: Poster Session: Superconductivity

TT 5.25: Poster

Montag, 27. September 2021, 13:30–16:00, P

Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators — •Cenk Beydeda, Konstantin Nikolaou, Marius Tochtermann, Nikolaj G. Ebensperger, Gabriele Untereiner, Ahmed Farag, Philipp Karl, Monika Ubl, Harald Giessen, Martin Dressel, and Marc Scheffler — Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany

Planar superconducting microwave transmission line resonators can be operated at multiple harmonic resonance frequencies, which allows covering wide spectral regimes with high sensitivity, as is desired e.g. for cryogenic microwave spectroscopy. A common complication of such experiments is the presence of undesired “spurious” additional resonances. Identifying the nature of individual resonances (“designed” vs. “spurious”) can become challenging for higher frequencies or if elements with unknown material properties are included, as is common for microwave spectroscopy. Here various experimental strategies are discussed to distinguish designed and spurious modes in a broad frequency range up to 20 GHz. These strategies include tracking resonance evolution as a function of temperature, magnetic field, and microwave power. It is also demonstrated that applying minute amounts of dielectric or ESR(electron spin resonance)-active materials on the resonator lead to characteristic signatures in the various resonance modes, which depend on the local strength of the electric or magnetic microwave fields.