Selective Control of Conductance Modes in Multi-terminal Josephson Junctions

Abstract

The Andreev bound state spectra of multi-terminal Josephson junctions form an artificial band structure, which is predicted to host tunable topological phases under certain conditions. However, the number of conductance modes between the terminals of multi-terminal Josephson junction must be few in order for this spectrum to be experimentally accessible. In this work we employ a quantum point contact geometry in three-terminal Josephson devices. We demonstrate independent control of conductance modes between each pair of terminals and access to the single-mode regime coexistent with the presence of superconducting coupling. These results establish a full platform on which to realize tunable Andreev bound state spectra in multi-terminal Josephson junctions.

15 pages, 4 figures

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• Andreev processes in mesoscopic multi-terminal graphene Josephson junctions
• Multi-terminal Josephson junctions: a road to topological flux networks
• Magnetic-field-free nonreciprocal transport in graphene multi-terminal Josephson junctions
• A quantum interferometer for quartets in superconducting three-terminal Josephson junctions
• Bi2O2Se nanowires presenting high mobility and strong spin-orbit coupling
• Dynamical Stabilization of Multiplet Supercurrents in Multi-terminal Josephson Junctions