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arXiv · 2201.01373

Selective Control of Conductance Modes in Multi-terminal Josephson Junctions

Gino V. Graziano·Mohit Gupta·Mihir Pendharkar·Jason T. Dong·Connor P. Dempsey·Chris Palmstrøm·Vlad S. Pribiag
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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.

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Gino V. Graziano, Mohit Gupta, Mihir Pendharkar, Jason T. Dong, Connor P. Dempsey, Chris Palmstrøm, Vlad S. Pribiag. 2022-01-04. Selective Control of Conductance Modes in Multi-terminal Josephson Junctions. https://doi.org/10.1038/s41467-022-33682-2

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