Multiterminal Quasiballistic Josephson Effect in Monocrystalline Gold
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Published on: August 2, 2019
K B Polevoy1,2, G A Bobkov1, D S Kalashnikov1
1Moscow Institute of Physics and Technology, Dolgoprudny, 141700 Moscow region, Russia.
Abstract:
We report on the realization of a planar, quasiballistic Josephson junction array using a Au micron-sized single crystal. The system exhibits a nonlocal, multiterminal Josephson effect, where the supercurrent between any two superconducting leads is governed by the phase coherence across the entire crystal. Key evidence includes a nonmonotonic dependence of the critical current on junction length and magnetic interference patterns with periods corresponding to the shared normal-metal area. Nonlocal transport measurements further confirm that the supercurrent between two electrodes depends on the phase configuration of all the others. Our results, supported by a developed theoretical model, establish a platform for exploring complex superconducting phenomena in multiterminal ballistic systems.
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