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Current-Phase Relation of Ballistic Graphene Josephson Junctions

机译：弹道石墨烯Josephson结的当前相关系

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摘要

The current-phase relation (CPR) of a Josephson junction (JJ) determines how the supercurrent evolves with the superconducting phase difference across the junction. Knowledge of the CPR is essential in order to understand the response of a JJ to various external parameters. Despite the rising interest in ultra-clean encapsulated graphene JJs, the CPR of such junctions remains unknown. Here, we use a fully gate-tunable graphene superconducting quantum intereference device (SQUID) to determine the CPR of ballistic graphene JJs. Each of the two JJs in the SQUID is made with graphene encapsulated in hexagonal boron nitride. By independently controlling the critical current of the JJs, we can operate the SQUID either in a symmetric or asymmetric configuration. The highly asymmetric SQUID allows us to phase-bias one of the JJs and thereby directly obtain its CPR. The CPR is found to be skewed, deviating significantly from a sinusoidal form. The skewness can be tuned with the gate voltage and oscillates in anti-phase with Fabry-Perot resistance oscillations of the ballistic graphene cavity. We compare our experiments with tight-binding calculations which include realistic graphene-superconductor interfaces and find a good qualitative agreement.
机译：Josephson结（JJ）的当前相位关系（CPR）决定了超电流如何随着交叉点的超导相位差而发展。对CPR的了解是必不可少的，以便了解JJ对各种外部参数的响应。尽管对超清洁封装石墨烯JJS的兴趣升高，但这种连接的CPR仍然未知。在这里，我们使用完全栅极可调石墨烯超导量子Interceumetum Interuity算子（鱿鱼）来确定弹道石墨烯JJS的CPR。鱿鱼中的两个JJ中的每一个都是用封装在六边形氮化物中的石墨烯制成的。通过独立控制JJS的临界电流，我们可以以对称或不对称配置操作鱿鱼。高度不对称的鱿鱼允许我们相位偏置JJS，从而直接获得其CPR。发现CPR是倾斜的，从正弦形式显着偏离。可以用栅极电压调谐偏斜，并在抗阶段以抗弹性石墨烯腔的抗电阻振荡振荡。我们将我们的实验与紧密绑定计算进行比较，包括现实石墨烯 - 超导界面，并找到良好的定性协议。

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