Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 51: Topological Superconductors
TT 51.1: Vortrag
Donnerstag, 20. März 2025, 16:45–17:00, H32
Disentangling the Individual Junctions in Multi-Terminal Devices — •Josua Thieme1,2, Nisha Shahi1, Abdur Rehman Jalil1, Benedikt Frohn1, Detlev Grützmacher1,2, and Peter Schüffelgen1 — 1Forschungszentrum Jülich, Germany — 2RWTH Aachen, Germany
One avenue towards building a topological qubit, is by creating and manipulating Majorana zero modes in a hybrid device made from s-wave superconductors and 3D topological insulators (TIs). Such hybrid multi-terminal devices possess an increased number of interfaces and the coupling between all electrodes needs to be assured. We present low-temperature measurements of a TI-based three-terminal Josephson device fabricated by a combination of selective-are growth of (BiSb)2Te3 and shadow evaporation of Nb. This approach allows for the in-situ fabrication of Josephson devices with an exceptional interface quality, which is important for obtaining a strong proximity effect. In our measurements, we find quartet resonances, formed by two entangled Cooper pairs. Additionally, we present a method on how to disentangle the contributions of individual junctions in a multi-terminal device.
Keywords: multi-terminal Josephson junctions; topological insulator; superconductivity; quartet