手性晶体中高阶拓扑的可视化
Visualizing higher-fold topology in chiral crystals
AI总结：
本研究利用化学工程与光电子能谱，首次发现手性晶体的高阶拓扑，确定高阶手性费米子所有体态分支，揭示多能隙体态-边界对应关系，推动非常规拓扑响应研究。
摘要：
物质的新型拓扑相是发现非常规电磁现象的富有成果的平台。高阶拓扑就是其中一例，其低能描述超越了标准模型类比。尽管有密集的实验研究，但高阶手性费米子的多能隙拓扑特性仍缺乏确凿证据。在本快报中，我们利用精细调节的化学工程和具有光子能量对比度的光电子能谱，发现了手性晶体的高阶拓扑。我们首次确定了高阶手性费米子的所有体态分支，这对于允许我们在多个带间能隙中探索独特的费米弧表面态至关重要，这些表面态展现出涌现的阶梯结构。通过对样品进行设计的化学门控并结合我们的测量，我们揭示了前所未有的多能隙体态-边界对应关系。我们对多能隙电子拓扑的证明将推动未来关于非常规拓扑响应的研究。
英文摘要：
Novel topological phases of matter are fruitful platforms for the discovery of unconventional electromagnetic phenomena. Higher-fold topology is one example, where the low-energy description goes beyond Standard Model analogs. Despite intensive experimental studies, conclusive evidence remains elusive for the \textit{multi-gap topological nature of higher-fold chiral fermions}. In this Letter, we leverage a combination of fine-tuned chemical engineering and photoemission spectroscopy with photon energy contrast to discover the higher-fold topology of a chiral crystal. We identify all bulk branches of a higher-fold chiral fermion for the first time, critically important for allowing us to explore unique Fermi arc surface states in multiple inter-band gaps, which exhibit an emergent ladder structure. Through designer chemical gating of the samples in combination with our measurements, we uncover an unprecedented multi-gap bulk boundary correspondence. Our demonstration of multi-gap electronic topology will propel future research on unconventional topological responses.
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