Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.20: Poster

Monday, March 17, 2025, 15:00–18:00, P4

Interaction of supercurrents in multiterminal graphene Josephson junctions — •Paul Maier, Romain Danneau, and Detlef Beckmann — Institut für Quantenmaterialien und Technologien, Karlsruher Institut für Technologie

Topological states are predicted to exist in the Andreev bound state spectrum of multiterminal Josephson junction with four or more terminals [1]. Superconductor graphene hybrid structures are especially suitable to realize such devices due to the gate tunability of graphene and the low contact resistance necessary to form Andreev bound states. Understanding the distribution of supercurrent in graphene multiterminal Josephson junctions is one step in the search for these states. We report on the experimental investigation of transport in a four-terminal graphene Josephson junction. We observe magnetic interference patterns in two-terminal measurements and critical current contours in multiterminal measurements, and compare the results to theoretical simulations.

[1] R.-P. Riwar et al., Nat. Commun. 7, 11167 (2016).

Keywords: graphene; multi-terminal Josephson junction