近日，中国科学技术大学王震宇团队报道了kagome超导体中对称破缺近藤筛分和零能量模式。2026年3月24日出版的《自然—物理学》杂志发表了这项成果。
量子物质态会因缺陷而重新组织自身，从而产生反映底层相本征特性的涌现局域激发。例如，磁性杂质在费米液体中会产生近藤屏蔽，在常规超导体中则会产生由-芝-鲁西诺夫态。然而，在笼目超导体 AV3Sb5（其中A代表K、Rb或Cs）中，这类杂质是否能引发非常规现象仍不清楚——该材料体系具有与其电荷密度波相互交织的所谓环路电流序。
研究组展示了CsV3Sb5中磁性掺杂剂附近近藤共振态的出现。利用扫描隧道显微镜，发现磁性Cr杂质附近的近藤屏蔽空间结构打破了笼目晶格的所有面内镜像对称性。这种对称性破缺表明存在由理论提出的轨道环路电流序所衍生的底层电子手性。研究组还观测到由弱磁性V空位产生的显著零偏压电导峰。这些结果为理解笼目晶格化合物中量子态的共存与相互作用提供了深刻见解。
附：英文原文
Title: Symmetry-broken Kondo screening and zero-energy mode in a kagome superconductor
Author: Tu, Yubing, Zhang, Zongyuan, Lu, Wenjian, Xiao, Yuhang, Han, Tao, Lv, Run, Wang, Zhuying, Zhou, Zekun, Hou, Xingyuan, Hao, Ning, Wang, Zhenyu, Chen, Xianhui, Shan, Lei
Issue&Volume: 2026-03-24
Abstract: Quantum states of matter reorganize themselves in response to defects, giving rise to emergent local excitations that reflect the intrinsic properties of the underlying phases. Magnetic impurities, for example, generate Kondo screening in a Fermi liquid and Yu–Shiba–Rusinov states in a conventional superconductor. Yet, it remains unclear whether such impurities can trigger unconventional phenomena in the kagome superconductor AV3Sb5, where A represents K, Rb or Cs, which hosts a putative loop current order intertwined with its charge density wave. Here we demonstrate the emergence of Kondo resonance states near magnetic dopants in CsV3Sb5. Using scanning tunnelling microscopy, we find that the spatial structure of the Kondo screening near magnetic Cr impurities breaks all in-plane mirror symmetries of the kagome lattice. This symmetry breaking suggests the presence of an underlying electronic chirality arising from the proposed orbital loop current order. We also observe a pronounced zero-bias conductance peak arising from weakly magnetic V vacancies. These results provide insight into the coexistence and interplay of quantum states in kagome lattice compounds.
DOI: 10.1038/s41567-026-03223-5
Source: https://www.nature.com/articles/s41567-026-03223-5