Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 76: Poster Session: Transport 2
TT 76.5: Poster
Donnerstag, 23. März 2017, 15:00–19:00, P2-OG1
Superconducting microwave resonator designs for electron paramagnetic resonance at millikelvin temperatures — •Petio Natzkin1,2, Stefan Weichselbaumer1,2, Christoph W. Zollitsch1,2, 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 Initiative Munich, Munich, Germany
Superconducting coplanar microwave resonators are used in a large variety of applications, ranging from radiation detectors to experiments in quantum information processing. We use superconducting microwave resonators made from Niobium for electron paramagnetic resonance spectroscopy at millikelvin temperatures. The coplanar lumped-element design garanatees small mode volumes and large filling factors. Together with the high quality factor in the order of 104, this results in an increased spin sensitivity compared to conventional EPR resonators. However, the field distribution of such a quasi two-dimensional resonator is typically inhomogeneous hindering a coherent manipulation of the spin ensemble. We present the investigation of different resonator designs with particular emphasis on the homogeneity of the B1 field. Furthermore, we compare the predictions of simple analytical models and finite element simulations with first characterization measurements of these resonator types.
The authors acknowledge financial support from the German Research Foundation (DFG) via the focus program SPP 1601 (HU1861/2-1).