Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Superconducting Electronics: SQUIDs, Qubits, Circuit QED I
TT 38.1: Vortrag
Mittwoch, 19. März 2025, 16:45–17:00, H32
Microwave characterization of planar Josephson junction arrays — •Alexander Kirchner1, Johanna Berger1, Simon Feyrer1, Narges Momeni1, Matthias Kronseder1, Michael Prager1, Dieter Schuh1, Dominique Bougeard1, Nicola Paradiso1, Christoph Strunk1, and Leandro Tosi2,1 — 1Institut für Experimentelle und Angewandte Physik, University of Regensburg, 93040 Regensburg, Germany — 2Centro Atómico Bariloche and Insitituto Balseiro, CNEA, CONICET, San Charlos de Bariloche, Río Negro 8400, Argentina
We present microwave characterization measurements of Josephson junction arrays (JJAs) based on a proximitized Al-InAs quantum well heterostructure. JJAs can be used to achieve high inductances, suitable for the implementation of quantum circuits. They also provide an excellent test-bed for studying the microscopic excitations of hybrid superconductor-semiconductor devices associated to the presence of Andreev states. By probing the low-energy plasmon modes of these devices, we have been able to derive the Josephson inductance and to demonstrate its tunability in out-of-plane magnetic field, following the Fraunhofer diffraction pattern of planar Josephson junctions. Furthermore, the temperature dependence of the inductance provides information about the induced superconducting gap in the two-dimensional electron gas.
Keywords: josephson junction array; quantum circuits; semiconductor/superconductor heterostructure; two-dimensional electron gas; josephson inductance