发表机构
Institute of Physics, Chinese Academy of Sciences; Tsinghua University; Max Planck Institute for Chemical Physics of Solids; Chinese Academy of Sciences; Diamond Light Source; University of Oxford; ShanghaiTech University（中国科学院物理研究所; 清华大学; 马克斯·普朗克固体化学物理研究所; 中国科学院; 英国钻石光源; 牛津大学; 上海科技大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究在kagome金属Co3In2S2中发现狄拉克费米子与高阶范霍夫奇点共存导致的载流子二元性，输运与热力学行为分离，为拓扑关联物理提供模型平台。
AI 中文摘要
高迁移率狄拉克费米子与平带重电子的汇聚为涌现量子现象提供了范式。然而，这种引人入胜态的实验实现仍然难以捉摸。在本研究中，我们报道了kagome金属Co3In2S2中的双载流子体系，其中电荷输运由高迁移率电子主导，而热力学响应则表现出重电子行为。这种奇特的二元性源于费米面上拓扑狄拉克费米子与平带高阶（4阶）范霍夫奇点（HOVHSs）的共存，正如磁力矩量子振荡和角分辨光电子能谱所揭示的那样。狄拉克与HOVHS衍生载流子之间的相互作用可以通过一个最小双口袋模型来描述，表现为约100 K以上的亚线性电阻率以及低温下场诱导的非费米液体行为。我们的研究确立了Co3In2S2作为探索拓扑与关联效应交汇处多体物理的模型平台，并为设计承载多种涌现态的量子材料提供了基础框架。
英文摘要
The convergence of highly mobile Dirac fermions and flat-band heavy electrons offers a paradigm for emergent quantum phenomena. However, experimental realization of such intriguing state remains elusive. In this study, we report a dual carrier regime in the kagome metal Co3In2S2, wherein the charge transport is governed by high-mobility electrons while the thermodynamic responses exhibit heavy-electron behavior. This exotic duality arises from the coexistence of topological Dirac fermions and flat-band high-order (4th-order) Van Hove singularities (HOVHSs) at the Fermi surface, as revealed by magnetic-torque quantum oscillation and angle-resolved photoemission spectroscopy. The interaction between Dirac and HOVHS-derived carriers can be captured by a minimal two-pocket model, manifesting as sublinear resistivity above ~100 K and field-induced non-Fermi-liquid behavior at low temperatures. Our study establishes Co3In2S2 as a model platform for exploring many-body physics at the intersection of topology and correlation effects, and provides a foundational framework for designing quantum materials hosting diverse emergent states.
Comments27 pages, 5 figs
