We investigate the electronic properties of ballistic planar Josephson junctions with multiple superconducting terminals. Our devices consist of monolayer graphene encapsulated in boron nitride with molybdenum-rhenium contacts. Resistance measurements yield multiple resonant features, which are attributed to supercurrent flow among adjacent and non-adjacent Josephson junctions. In particular, we find that superconducting and dissipative currents coexist within the same region of graphene. We show that the presence of dissipative currents primarily results in electron heating and estimate the associated temperature rise. We find that the electrons in encapsulated graphene are efficiently cooled through the electron-phonon coupling.
@article{arxiv.1810.11632,
title = {Supercurrent Flow in Multi-Terminal Graphene Josephson Junctions},
author = {Anne W. Draelos and Ming-Tso Wei and Andrew Seredinski and Hengming Li and Yash Mehta and Kenji Watanabe and Takashi Taniguchi and Ivan V. Borzenets and Francois Amet and Gleb Finkelstein},
journal= {arXiv preprint arXiv:1810.11632},
year = {2019}
}