Multiterminal Ballistic Josephson Effect in Monocrystalline Gold

K. B. Polevoy; G. A. Bobkov; D. S. Kalashnikov; A. G. Shishkin; I. V. Trofimov; A. M. Bobkov; M. A. Tarkhov; I. V. Bobkova; V. S. Stolyarov

arXiv · 2512.00409

Multiterminal Ballistic Josephson Effect in Monocrystalline Gold

K. B. Polevoy·G. A. Bobkov·D. S. Kalashnikov·A. G. Shishkin·I. V. Trofimov·A. M. Bobkov·M. A. Tarkhov·I. V. Bobkova·V. S. Stolyarov

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Abstract

We report on the realization of a planar, quasi-ballistic 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 non-monotonic 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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K. B. Polevoy, G. A. Bobkov, D. S. Kalashnikov, A. G. Shishkin, I. V. Trofimov, A. M. Bobkov, M. A. Tarkhov, I. V. Bobkova, V. S. Stolyarov. 2025-11-29. Multiterminal Ballistic Josephson Effect in Monocrystalline Gold. https://arxiv.org/abs/2512.00409

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