Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.49: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Comparison of superconducting microwave resonators for electron paramagnetic resonance at low tempertures — •Andreas Faltermeier1,2, Stefan Weichselbaumer1,2, Matthias Althammer1,2, Rudolf Gross1,2,3, and Hans Huebl1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Nanosystems Inititative Munich, München, Germany
Superconducting coplanar microwave resonators are used for various applications, ranging from sensitive radiation detectors to photon storage units required for quantum information processing. All applications rely on a careful tailoring of the resonator. We investigate superconducting microwave resonators made from niobium nitride and niobium grown by ultra-high vacuum sputter deposition with the aim of pursuing electron paramagnetic resonance (EPR) spectroscopy. The geometric layout of our resonator is based on coplanar lumped element design, which guaranatees small mode volumes and large filling factors. Moreover, these resonators have typically ultra-high quality factors. Together, this results in an improved spin sensitivity compared to conventional EPR resonators. We quantitatively compare the performance of the resonator properties for Nb and NbN including the impact of the kinetic inductance. Furthermore, we compare between experimental results with numerical simulations.