体态中涌现的不可穿越能带交叉：拓扑节线半金属ZrAs$_2$
Emergent impervious band crossing in the bulk in topological nodal line semimetal ZrAs$_2$
AI总结：
本研究结合ARPES和DFT，实验证实了ZrAs$_2$中非辛对称性保护的节线及体态中不可穿越能带交叉，深化了对该拓扑节线半金属电子结构的理解。
摘要：
拓扑节线半金属代表了一类具有独特电子结构和丰富对称性的材料，承载着具有非平凡拓扑性质的电子态。其中，ZrAs$_2$尤为突出，其特征是由非辛对称性调控的动量空间中的节线。本研究将角分辨光电子能谱（ARPES）与密度泛函理论（DFT）计算相结合，探索ZrAs$_2$的电子态。我们的研究提供了非辛对称性保护的能带交叉和节线在ZrAs$_2$中的实验证据。在ARPES扫描中，我们在不同光子能量下观察到了与节线相关的独特的表面态和体态。我们的结果，得到基于DFT计算的支持，揭示了锚定在布里渊区特定点（特别是S点）的不可穿越能带交叉。通过slab计算阐明了交叉附近的表面带和体态，证实了实验发现。这些发现增进了我们对ZrAs$_2$电子结构的理解。
英文摘要：
Topological nodal-line semimetals represent a unique class of materials with intriguing electronic structures and rich of symmetries, hosting electronic states with nontrivial topological properties. Among these, ZrAs$_2$ stands out, characterized by its nodal lines in a momentum space, governed by nonsymmorphic symmetries. This study integrates angle-resolved photoemission spectroscopy (ARPES) with density functional theory (DFT) calculations to explore the electronic states of ZrAs$_2$. Our study provides experimental evidence of nonsymmorphic symmetry-protected band crossing and nodal lines in ZrAs$_2$. In ARPES scans, we observed a distinctive surface and bulk states at different photon energies associated with nodal lines. Our results, supported by calculations based on DFT, unveil such impervious band crossing anchored at specific points in the Brillouin zone, with particular emphasis on the S point. Surface bands and bulk states near the crossing are elucidated through slab calculations, corroborating experimental findings. These findings enhance our understanding of the electronic structure of ZrAs$_2$.
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