Supercurrent Flow in Multiterminal Graphene Josephson Junctions
Supercurrent Flow in Multiterminal Graphene Josephson Junctions
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DOI：
10.1021/acs.nanolett.8b04330
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发表时间：
2019-02-01
期刊：
影响因子：
10.8
通讯作者：
Finkelstein, Gleb
中科院分区：
文献类型：
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作者：
Draelos, Anne W.;Wei, Ming-Tso;Finkelstein, Gleb
我们研究了具有多个超导终端的弹道平面约瑟夫森结的电子性质。我们的器件由单层石墨烯组成，包裹在氮化硼中，带有钼-Re触点。电阻测量产生了多个谐振特征，这归因于相邻和非相邻约瑟夫森结之间的超流。特别是，我们发现超导电流和耗散电流共存于石墨烯的同一区域。我们证明了耗散电流的存在主要导致电子加热，并估计了与之相关的温升。我们发现，电子-声子耦合有效地冷却了石墨烯中的电子。
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 nonadjacent 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.