Thin transition metal dichalcogenides sustain superconductivity at large in-plane magnetic fields due to Ising spin-orbit protection, which locks their spins in an out-of-plane orientation. Here we use thin $\mathrm{Nb}{\mathrm{Se}}_2$ as superconducting electrodes laterally coupled to graphene, making a planar, all van der Waals two-dimensional Josephson junction (2DJJ). We map out the behavior of these novel devices with respect to temperature, gate voltage, and both out-of-plane and in-plane magnetic fields. Notably, the 2DJJs sustain supercurrent up to parallel fields as high as 8.5 T, where the Zeeman energy $E_Z$ rivals the Thouless energy $E_{Th}$, a regime hitherto inaccessible in graphene. As the parallel magnetic field $H_{\parallel }$ increases, the 2DJJ's critical current is suppressed and in a few cases undergoes suppression and recovery. We explore the behavior in $H_{\parallel }$ by considering theoretically two effects: a 0-$\pi$ transition induced by tuning of the Zeeman energy and the unique effect of ripples in an atomically thin layer which create a small spatially varying perpendicular component of the field. The 2DJJs have potential utility as flexible probes for two-dimensional superconductivity in a variety of materials and introduce high $H_{\parallel }$ as a newly accessible experimental knob.

中文翻译：

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平行磁场中的平面石墨烯-NbSe2Josephson结

由于具有伊辛自旋轨道保护功能，薄的过渡金属二卤化物在大的面内磁场中保持超导性，从而将其自旋锁定在面外方向。在这里我们用薄$铌{硒}_{\mathrm{2个}}$如超导电极横向耦合到石墨烯，形成一个平面的所有范德华二维约瑟夫森结（2DJJ）。我们针对温度，栅极电压以及平面外和平面内磁场绘制了这些新型器件的行为。值得注意的是，2DJJ可以承受高达8.5 T的平行磁场的超电流，而塞曼能量$E_{ž}$ 可以与Thouless能量匹敌 $E_{ŤH}$，这是迄今为止石墨烯尚无法实现的机制。作为平行磁场$H_{\parallel }$增加2DJJ的临界电流，在某些情况下会受到抑制和恢复。我们探索行为$H_{\parallel }$ 从理论上考虑两个效果：0-$\pi$由Zeeman能量的调整和原子薄层中的波纹的独特效应引起的跃迁会产生较小的空间变化的垂直场分量。2DJJ具有潜在的实用性，可用于在各种材料中实现二维超导的柔性探头，并引入高$H_{\parallel }$ 作为新近使用的实验旋钮。