非常规金属NiTe₂基约瑟夫森结中铰链超流的磁场滤波
Magnetic field filtering of the hinge supercurrent in unconventional metal NiTe$_2$-based Josephson junctions
AI总结：
本研究在NiTe₂基约瑟夫森结中观测到显著铰链超流，发现沿电流方向的面内磁场可滤除体超流、保留纯净铰链超流，结合理论计算证实了该材料的非常规属性与受阻铰链态，为探测拓扑/非常规材料的边界态提供了有效手段。
摘要：
具有边界（表面/边缘/铰链）态的拓扑材料已吸引了大量研究兴趣。此外，非常规（受阻原子）材料因其受阻边界态近期也受到广泛关注。实验中，构建于具有边界态的材料上的约瑟夫森结（JJs）会产生独特的边界超流，这一现象已被用作一种强有力的诊断手段。本文中，我们报道了在NiTe₂基JJs中观测到显著铰链超流的结果。特别地，沿约瑟夫森电流方向施加面内磁场可快速抑制体超流，并保留近乎纯净的铰链超流，即超流的磁场滤波效应。进一步的系统对比分析和理论计算证实，NiTe₂中存在非常规属性和受阻铰链态。我们的研究结果揭示了非常规金属NiTe₂中的独特铰链态，并证明面内磁场是滤除无用体贡献、从而凸显隐藏在拓扑/非常规材料中铰链态的有效方法。
英文摘要：
Topological materials with boundary (surface/edge/hinge) states have attracted tremendous research interest. Besides, unconventional (obstructed atomic) materials have recently drawn lots of attention owing to their obstructed boundary states. Experimentally, Josephson junctions (JJs) constructed on materials with boundary states produce the peculiar boundary supercurrent, which was utilized as a powerful diagnostic approach. Here, we report the observations of conspicuous hinge supercurrent in NiTe$_2$-based JJs. Particularly, applying an in-plane magnetic field along the Josephson current could rapidly suppress the bulk supercurrent and retain the nearly pure hinge supercurrent, namely the magnetic field filtering of supercurrent. Further systematic comparative analysis and theoretical calculations demonstrate the existence of unconventional nature and obstructed hinge states in NiTe$_2$. Our results revealed the unique hinge states in unconventional metal NiTe$_2$, and demonstrated in-plane magnetic field as an efficient method to filter out the futile bulk contributions and thereby to highlight the hinge states hidden in topological/unconventional materials.
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