论文标题
高磁场稳定性在平面石墨烯-NBSE $ _2 $ squid中
High magnetic field stability in a planar graphene-NbSe$_2$ SQUID
论文作者
论文摘要
薄的NBSE $ _2 $保留了高达30吨的高平面磁场的超导性。在这项工作中，我们构建了一个原子上薄的范德华瓦斯鱿鱼，其中电流通过两个平行的石墨烯弱链路在NBSE $ _2 $之间流动。该完全平面设备在高平面场上保持独特的稳定。这使追踪临界电流干扰模式的演变是该场的函数，最大为4.5 t，从而使NM级敏感性对与完美原子平面的偏差偏离。我们提出了从测量的干扰图中检索不对称电流分布的数值方法，并建议在没有相信息的情况下探测双连接几何形状的新应用以探测电流密度。干扰图显示出惊人的场驱动过渡，表明超电流的重新分布到狭窄的通道。我们的结果表明存在具有特殊稳定性的平面磁场的优选电导通道。
Thin NbSe$_2$ retains superconductivity at high in-plane magnetic field up to 30 T. In this work we construct an atomically thin, all van der Waals SQUID, in which current flows between NbSe$_2$ contacts through two parallel graphene weak links. This fully planar device remains uniquely stable at high in-plane field. This enables tracing the evolution of the critical current interference patterns as a function of the field up to 4.5 T, allowing nm-scale sensitivity to deviations from a perfect atomic plane. We present numerical methods to retrieve asymmetric current distributions J$_0$ from measured interference maps, and suggest a new application of the dual junction geometry to probe the current density in the absence of phase information. The interference maps exhibit a striking field-driven transition, indicating a redistribution of supercurrents to narrow channels. Our results suggest the existence of a preferred conductance channel with an exceptional stability to in-plane magnetic field.
