发表机构
Max Planck Institute for Chemical Physics of Solids; Leibniz Institute for Solid State and Materials Research, IFW Dresden; Donostia International Physics Center; Luxembourg Institute of Science and Technology (LIST); Technische Universität Dresden; Helmholtz-Zentrum Berlin für Materialien und Energie（马克斯·普朗克固体化学物理研究所; 德累斯顿IFW莱布尼茨固态与材料研究所; 圣塞巴斯蒂安国际物理中心; 卢森堡科学与技术研究所; 德累斯顿工业大学; 柏林亥姆霍兹材料与能源中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过体敏感和表面敏感实验及第一性原理计算，发现拓扑铁磁体UAsS中磁性驱动关联量子相自发空间分离，表面涌现出近藤平带，为关联拓扑系统研究开辟新方向。
AI 中文摘要
现代凝聚态物理的一个核心目标是揭示由强电子关联、磁性和能带拓扑相互交织效应产生的新量子物态。由近藤相互作用产生的重费米子相是电子关联最显著的表现形式之一，并且已在几种非磁性材料中识别出拓扑重费米子态。然而，它们与磁有序竞争所导致的后果在很大程度上仍未得到探索。在此，我们揭示了一种新现象：关联量子相的自发空间分离。通过证明磁性可以驱动不同的强关联电子态在单一材料的不同区域共存，我们的工作确立了一种组织量子物质的先前未知机制，并为关联拓扑系统的研究开辟了新方向。利用体敏感探针，我们表明UAsS晶体在体态中是金属铁磁体，仅具有中等程度的关联驱动的能带重整化。第一性原理计算揭示了同时拥有节线和外尔点的拓扑电子结构，指向丰富的底层拓扑。角分辨光电子能谱（ARPES）测量与这些预测一致，分辨出了节线和外尔交叉点。形成鲜明对比的是，表面敏感的ARPES和扫描隧道显微镜/光谱（STM/STS）测量揭示了一个钉扎在费米能级的显著平带，伴随一个尖锐的共振——这是第一性原理计算未捕捉到的涌现强关联近藤态的标志。
英文摘要
A central goal of modern condensed matter physics is to uncover new quantum states of matter arising from the intertwined effects of strong electron correlations, magnetism, and band topology. Heavy-fermion phases, generated by Kondo interactions, represent one of the most remarkable manifestations of electronic correlations, and topological heavy-fermion states have been identified in several non-magnetic materials. Yet, the consequences of their competition with magnetic order have remained largely unexplored. Here, we reveal a new phenomenon: the spontaneous spatial separation of correlated quantum phases. By showing that magnetism can drive distinct strongly correlated electronic states to coexist in different regions of a single material, our work establishes a previously unknown mechanism for organizing quantum matter and opens a new direction in the study of correlated topological systems. Using \emph{bulk-sensitive} probes, we show that UAsS crystals are, in the bulk, metallic ferromagnets with only moderate correlation-driven band renormalizations. First-principles calculations reveal a topological electronic structure hosting both nodal lines and Weyl points, pointing to a rich underlying topology. Angle-resolved photoemission spectroscopy (ARPES) measurements are consistent with these predictions, resolving the nodal lines and Weyl crossings. In striking contrast, \emph{surface-sensitive} ARPES and scanning tunneling microscopy/spectroscopy (STM/STS) measurements reveal a pronounced flat band pinned at the Fermi level, accompanied by a sharp resonance -- hallmarks of an emergent, strongly correlated Kondo state not captured by first-principles calculations.
