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TT: Fachverband Tiefe Temperaturen

TT 73: Superconductivity: Tunneling and Josephson Junctions

TT 73.7: Vortrag

Donnerstag, 12. März 2026, 11:15–11:30, CHE/0089

Supercurrent Interference in Planar Josephson Junction Arrays Probed by Microwave Excitations — •Alexander Kirchner¹, Simon Feyrer¹, Vjeko Dimić¹, Sebastian Ramsauer¹, Johanna Berger¹, Narges Momeni¹, Francisco Jesus Matute-Cañadas², Davide Curcio³, Matthias Kronseder¹, Michael Prager¹, Dieter Schuh¹, Dominique Bougeard¹, Giorgio Biasiol³, Alfredo Levy Yeyati², Nicola Paradiso¹, Christoph Strunk¹, and Leandro Tosi^1,4 — ¹Institut für Experimentelle und Angewandte Physik, University of Regensburg, Regensburg, Germany — ²Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid, Spain — ³CNR-IOM Istituto Officina dei Materiali, Trieste, Italy — ⁴Centro Atómico Bariloche and Insitituto Balseiro, CNEA, CONICET, San Charlos de Bariloche, Río Negro, Argentina

We present measurements of one dimensional Josephson junction arrays based on a hybrid superconductor-semiconductor quantum well heterostructure probed at microwave frequencies. The behavior of their plasma modes as a function of an applied magnetic field reveals interference patterns: an out-of-plane field results in a Fraunhofer-like pattern, from which we extract the effective transparency of the junctions; furthermore, periodic oscillations of the inductance occur when applying an in-plane magnetic field. The periodicity of these oscillations scales with the length of the island, pointing towards an orbital origin.

Keywords: josephson junction array; hybrid quantum circuits; semiconductor/superconductor heterostructure; Rashba Spin-orbit interaction; josephson inductance