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Quantum Griffiths Singularity in Ordered Artificial Superconducting-Islands-Array on Graphene
Nano Letters ( IF 9.6 ) Pub Date : 2024-02-16 , DOI: 10.1021/acs.nanolett.3c03870 Fan Chen 1, 2 , Yixin Liu 1, 2 , Wang Guo 1, 2 , Teng Wang 1 , Ziao Tian 1 , Miao Zhang 1 , Zhongying Xue 1 , Gang Mu 1 , Xiaofu Zhang 1 , Zengfeng Di 1
Nano Letters ( IF 9.6 ) Pub Date : 2024-02-16 , DOI: 10.1021/acs.nanolett.3c03870 Fan Chen 1, 2 , Yixin Liu 1, 2 , Wang Guo 1, 2 , Teng Wang 1 , Ziao Tian 1 , Miao Zhang 1 , Zhongying Xue 1 , Gang Mu 1 , Xiaofu Zhang 1 , Zengfeng Di 1
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Quantum Griffiths phase (QGP) is a novel quantum phenomenon of quantum phase transition in two-dimensional (2D) superconductors, and the emergence of inhomogeneous superconducting rare regions immersed in a metallic matrix is theoretically related to the quantum Griffiths singularity (QGS). However, the theoretical proposal of superconducting rare regions still lacks intuitive experimental verification. Here, we construct an artificial ordered superconducting-islands-array on monolayer graphene with the aid of an anodic aluminum oxide (AAO) membrane. The QGS under both in-plane and out-of-plane magnetic fields is evidenced by the divergent dynamical critical exponent and is in compliance with the direct activated scaling behavior. The phase diagram clearly shows that the QGP is indeed bred in the rare superconducting regions within isolated superconducting islands with a vanished quantum coherence. Our results reveal the universal features of QGP in artificial heterostructured systems and provide a visualized platform for the theoretical proposal of QGS.
中文翻译：
石墨烯有序人工超导岛阵列中的量子格里菲斯奇异性
量子格里菲斯相（QGP）是二维（2D）超导体中量子相变的一种新颖的量子现象，浸入金属基体中的不均匀超导稀有区域的出现在理论上与量子格里菲斯奇点（QGS）有关。然而，超导稀有区的理论提出仍缺乏直观的实验验证。在这里，我们借助阳极氧化铝（AAO）膜在单层石墨烯上构建了人工有序超导岛阵列。面内和面外磁场下的 QGS 由发散的动力学临界指数证明，并且符合直接激活的标度行为。相图清楚地表明，QGP 确实是在量子相干性消失的孤立超导岛内的稀有超导区域中孕育的。我们的结果揭示了QGP在人工异质结构系统中的普遍特征，并为QGS的理论提出提供了可视化平台。
更新日期：2024-02-16
中文翻译：
石墨烯有序人工超导岛阵列中的量子格里菲斯奇异性
量子格里菲斯相（QGP）是二维（2D）超导体中量子相变的一种新颖的量子现象，浸入金属基体中的不均匀超导稀有区域的出现在理论上与量子格里菲斯奇点（QGS）有关。然而，超导稀有区的理论提出仍缺乏直观的实验验证。在这里，我们借助阳极氧化铝（AAO）膜在单层石墨烯上构建了人工有序超导岛阵列。面内和面外磁场下的 QGS 由发散的动力学临界指数证明，并且符合直接激活的标度行为。相图清楚地表明，QGP 确实是在量子相干性消失的孤立超导岛内的稀有超导区域中孕育的。我们的结果揭示了QGP在人工异质结构系统中的普遍特征，并为QGS的理论提出提供了可视化平台。
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