Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 73: Superconductivity: Tunneling and Josephson Junctions

TT 73.10: Talk

Thursday, March 12, 2026, 12:00–12:15, CHE/0089

Critical current surfaces of multiterminal graphene Josephson junctions — •Paul Maier, Romain Danneau, and Detlef Beckmann — Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany

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 high contact transparencies which are 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 four-terminal graphene Josephson junctions with current control or phase control by up to two superconducting loops and flux lines. We observe magnetic interference patterns in two-terminal measurements and critical current surfaces by controlling a total of three currents or phases in multiterminal measurements, the results show excellent agreement with theoretical simulations.
[1] R.P. Riwar et al., Nat Commun 7, 11167 (2016).

Keywords: graphene; multiterminal