Ce基蜂窝状铁磁体Ce$_2$Zn$_6$Ge$_3$的电子与拓扑性质
Electronic and topological properties of Ce-based honeycomb ferromagnet Ce$_2$Zn$_6$Ge$_3$
- New Cornerstone Science Laboratory, Center for Correlated Matter and School of Physics, Zhejiang University（新Cornerstone科学实验室，关联物质中心与物理学院，浙江大学）
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（凝聚态物理北京国家实验室，物理研究所，中国科学院）
- School of Physical Sciences, University of Chinese Academy of Sciences（物理科学学院，中国科学院大学）
- Institute of Fundamental and Transdisciplinary Research, Zhejiang University（基础与交叉研究 institute，浙江大学）
- State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University（硅与先进半导体材料国家重点实验室，浙江大学）
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China（先进微结构协同创新中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
通过量子振荡和DFT计算，揭示Ce$_2$Zn$_6$Ge$_3$具有局域铁磁性和非平庸拓扑，为研究磁性、拓扑及量子临界性提供平台。
AI中文摘要：
Ce$_2$Zn$_6$Ge$_3$是Ce基蜂窝状铁磁体的罕见实例。本文通过磁电阻和隧道二极管振荡器（TDO）测量中的量子振荡，并结合密度泛函理论（DFT）计算，报道了其费米面和拓扑性质。在量子振荡中观察到四个基本频率，其角度依赖性与假设4$f$电子局域化的DFT计算结果更为吻合，表明Ce$_2$Zn$_6$Ge$_3$中铁磁性具有局域化特征。此外，观察到负纵向磁电阻和非零Berry相位，以及计算电子结构揭示的费米能级附近存在两对Weyl点，为Ce$_2$Zn$_6$Ge$_3$的非平庸拓扑提供了有力证据。这些发现表明，Ce$_2$Zn$_6$Ge$_3$可能为研究磁性、拓扑、量子临界性及其相互作用提供独特平台。
英文摘要：
Ce$_2$Zn$_6$Ge$_3$ is a rare example of the Ce-based honeycomb ferromagnet. Here, we report its Fermi surface and topological properties by quantum oscillations via the magnetoresistance and tunnel diode oscillator (TDO) based measurements, in combination with the density functional theory (DFT) calculations. Four fundamental frequencies are observed in the quantum oscillations, and their angle dependence is more compatible with the DFT calculations assuming that the 4$f$-electrons are localized, suggesting a localized nature of ferromagnetism in Ce$_2$Zn$_6$Ge$_3$. Furthermore, the observations of negative longitudinal magnetoresistance and non-zero Berry phase, as well as the existence of two pairs of Weyl points near the Fermi level as revealed from the calculated electronic structures, provide strong evidence for nontrivial topology in Ce$_2$Zn$_6$Ge$_3$. These findings suggest that Ce$_2$Zn$_6$Ge$_3$ could provide a unique platform to study magnetism, topology, quantum criticality and their interplay.
