二维颗粒In-InOx复合材料中的稳健反常金属态和自对偶性
Robust anomalous metallic states and vestiges of self duality in two-dimensional granular In-InOx composites
摘要：
许多研究磁场调谐的超导体-绝缘体转变（H-SIT）的实验经常表现出低温电阻饱和，这被解释为从“失效超导体”中出现的异常金属相，从而挑战了传统理论。在这里，我们研究了一个随机的颗粒阵列铟岛上生长的铟氧化物的可选通层。通过调整晶粒间的耦合，我们揭示了一个广泛的磁场的电阻饱和观察，仔细的电磁滤波的条件下，在一个广泛的线性响应。暴露于外部宽带噪声或微波辐射被证明加强超导的趋势，在低场的全球超导相恢复。增加的磁场揭示了一个“避免的H-SIT”，它表现出在该转变之上/之下的电阻/电导的粒度诱导的对数发散，指向在真正的H-SIT中观察到的原始涌现二元性的可能痕迹。我们的结论是，异常金属相是密切相关的固有的不均匀性，表现出强大的行为在可达到的温度为强颗粒的二维系统。
英文摘要：
Many experiments investigating magnetic field tuned superconductor-insulator transition (H-SIT), often exhibit low-temperature resistance saturation, which is interpreted as an anomalous metallic phase emerging from a "failed superconductor," thus challenging conventional theory. Here we study a random granular array of indium islands grown on a gateable layer of indium-oxide. By tuning the intergrain couplings, we reveal a wide range of magnetic fields where resistance saturation is observed, under conditions of careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation is shown to strengthen the tendency of superconductivity, where at low field a global superconducting phase is restored. Increasing magnetic field unveils an "avoided H-SIT," that exhibits granularity-induced logarithmic divergence of the resistance/conductance above/below that transition, pointing to possible vestiges of the original emergent duality observed in a true H-SIT. We conclude that anomalous metallic phase is intimately associated with inherent inhomogeneities, exhibiting robust behavior at attainable temperatures for strongly granular two-dimensional systems.
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