Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Superconductivity: Tunneling and Josephson Junctions
TT 42.8: Vortrag
Donnerstag, 20. März 2025, 11:30–11:45, H32
Transport Measurements on Arrays of Four-Terminal Nb-Pt-Nb Josephson Junctions — •Justus Teller1,2, Christian Schäfer1,2, Benjamin Bennemann1, Matvey Lyatti1,2, Kristof Moors1,2, Detlev Grützmacher1,2, Roman-Pascal Riwar1, and Thomas Schäpers1,2 — 1Peter Grünberg Institut (PGI-9, PGI-10, PGI-2), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Germany
Arrays of interconnected two-terminal Josephson junctions have been investigated since the 1980’s. Usually, the array is realized as a square lattice with four two-terminal Josephson junctions connected in a square unit cell. Recently, Graziano et al. [1] showed that a multi-terminal Josephson junction can be described as a network of interconnected two-terminal Josephson junctions. Based on that concept, we present an array made of 30×30 four-terminal Nb-Pt-Nb Josephson junctions. The in-situ fabrication of large networks of Josephson junctions, using molecular beam epitaxy, is described. For this process, a periodically patterned shadow mask of Si3N4 has been developed. The physical concept of a multi-terminal Josephson junction array is introduced. Its theoretical explanation is based on a lattice of interconnected two-terminal Josephson junctions, each described as a resistively-capacitively-shunted junction. Critical current and resistance of the array show oscillations connected to its unit cell.
[1] G. V. Graziano et al., Phys. Rev. B 101, 054510 (2020).
Keywords: Multi-terminal Josephson junctions; Superconductivity; Arrays