Multiterminal Ballistic Josephson Effect in Monocrystalline Gold
Authors
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
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.
