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 and Vlad S. Pribiag ()
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Gino V. Graziano: University of Minnesota
Mohit Gupta: University of Minnesota
Mihir Pendharkar: Electrical and Computer Engineering, University of California Santa Barbara
Jason T. Dong: University of California Santa Barbara
Connor P. Dempsey: Electrical and Computer Engineering, University of California Santa Barbara
Chris Palmstrøm: Electrical and Computer Engineering, University of California Santa Barbara
Vlad S. Pribiag: University of Minnesota

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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 a 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 to 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.

Date: 2022
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DOI: 10.1038/s41467-022-33682-2

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