Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Superconductivity – Poster I
TT 22.26: Poster
Montag, 9. März 2026, 18:00–20:00, P1
High-quality superconducting broadband microwave structures for broadband electron spin resonance experiments — •Robert Pant1,2, Georg Mair1,2, Arjun Bhasker1,2, Sebastian Dominguez-Calderon1,2, Hans Huebl1,2,3, and Nadezhda Kukharchyk1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2School of Natural Sciences, Technische Universität München, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology, 80799 München, Germany
Electron spin resonance (ESR) spectroscopy is a powerful tool when it comes to studying the internal structure of materials and characterizing spins of unpaired electrons within. Superconducting microwave resonators are widely employed for such studies allowing to achieve strong coupling to spin systems. However, a generally narrow frequency range of their operation limits the amount of simultaneously coupled spin states. Over-coupled resonating structures can provide a substantially broader spectrum of microwave frequencies for resonance absorptions, thus improving the measurement efficiency. In the following work, several promising configurations of superconducting coplanar waveguide resonators in the over-coupled regime are developed, including a λ/2 transmission-line resonator with implemented interdigital capacitors that ensure an increased coupling rate to spin ensembles in the low frequency range of 0−4 GHz.
Keywords: Electron spin resonance; Spectroscopy; Broadband; Microwave; Resonator