Motivated by the recent discovery of charge density wave (CDW) order in the magnetic kagomé metal FeGe, we study the single-orbital $t$-$U$-$V_1$-$V_2$ model on the kagomé lattice, where $U$, $V_1$, and $V_2$ are the onsite, nearest neighbor, and next-nearest-neighbor Coulomb repulsions, respectively. When the Fermi level lies in the flat band, the instability toward ferromagnetic (FM) order gives rise to a FM half-metal at sufficiently large onsite $U$. Intriguingly, at band filling $n=17/24$, the Fermi level crosses the van Hove singularity of the spin-minority bands of the half-metal. We show that, due to the unique geometry and sublattice interference on the kagomé lattice at van Hove singularity, the intersite Coulomb interactions $V_1$ and $V_2$ drive a real and an imaginary bond-ordered $2a_0 \times 2a_0$ CDW instability, respectively. The FM loop current CDW with complex bond orders is a spin-polarized Chern insulator exhibiting the quantum anomalous Hall effect. The bond fluctuations are found to be substantially enhanced compared to the corresponding nonmagnetic kagomé metals at van Hove filling, providing a concrete model realization of the bond-ordered CDWs, including the FM loop current CDW, over the onsite charge density ordered states. When the spins are partially polarized, we find that the formation of bond-ordered CDWs enhances substantially the ordered magnetic moments. These findings provide physical insights for the emergence of loop-current and bond-ordered CDW and their interplay with magnetism on the kagomé lattice, with possible connections to the magnetic kagomé metal FeGe.
Theory of unconventional magnetism in a Cu-based kagome metal
Universität Würzburg（维尔茨堡大学）；Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche（意大利国家研究委员会材料研究所）；ETH Zürich（苏黎世联邦理工学院）；University of Geneva（日内瓦大学）；University of Technology Sydney（悉尼科技大学）；Columbia University（哥伦比亚大学）；University of Bologna（博洛尼亚大学）
Coexistence of long-range magnetic order and dynamical magnetism in the V-based Kagome metals: A combined thermodynamic and $μ$SR study
Kyushu Institute of Technology（九州工业大学）；Forschungszentrum Jülich（于利希研究中心）；Technical University of Munich（慕尼黑工业大学）；National Cheng Kung University（国立成功大学）
Effect of magnetism and phonons on localized carriers in the ferrimagnetic kagome metals GdMn$_6$Sn$_6$ and TbMn$_6$Sn$_6$
可果美金属具有独特的光谱，包括自由载流子在德鲁德型响应的贡献，本地化的载流子被视为一个强烈的温度依赖性本地化峰，并在某些情况下，声子显示强烈的异常。稀土可果美金属系列，$R$ Mn $_6$ Sn $_6$，为研究可果美金属在可变磁序存在下的电子性质提供了一个奇妙的场所。在这里，我们报告的$R$ Mn $_6$ Sn $_6$家族的两个成员，GdMn $_6$ Sn $_6$（面内亚铁磁体）和TbMn $_6$ Sn $_6$（面外亚铁磁体），在宽的能量范围（50 - 18000 cm $^{-1}$，相当于6.2 meV - 2.23 eV）下降到10 K的温度依赖的反射率的研究。在高温下，在大约160 cm $^{-1}$处观察到声子模式，当局域化峰线性地通过该模式时，在低于$\sim$ 150 K的TbMn $_6$ Sn $_6$中该声子模式被屏蔽。在GdMn $_6$ Sn $_6$中，声子的消失伴随着峰位饱和的开始，表明两个特征之间的不寻常的相互作用。
Phonons and magnetism of kagome FeGe probed by nuclear resonant scattering
Center for Correlated Matter and School of Physics, Zhejiang University（浙江大学相关物质研究中心和物理学院）；Department of Physics and Astronomy, Rice University（莱斯大学物理与天文学系）；Rice Laboratory for Emergent Magnetic Materials and Smalley-Curl Institute, Rice University（莱斯大学涌现磁性材料实验室及Smalley-Curl研究所）；Deutsches Elektronen-Synchrotron DESY（德国电子同步加速器研究所）；School of Emerging Technology, University of Science and Technology of China（中国科学技术大学前沿技术学院）；Hefei National Laboratory（合肥国家实验室）；New Cornerstone Science Laboratory, University of Science and Technology of China（中国科学技术大学新基石科学实验室）
Disorder-induced spin-cluster magnetism in a doped kagome spin liquid candidate
Georgia Institute of Technology（佐治亚理工学院）；Naval Research Laboratory（海军研究实验室）；Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；University of Virginia（弗吉尼亚大学）；Songshan Lake Materials Laboratory（松山湖材料实验室）；Massachusetts Institute of Technology（麻省理工学院）
Interplay of magnetic and thermodynamic responses in the kagome-triangular system
Key Laboratory of Multiscale Spin Physics (Ministry of Education), Beijing Normal University（北京师范大学多尺度自旋物理教育部重点实验室）；School of Physical Science and Technology, Beijing University of Posts and Telecommunications（北京邮电大学理学院）；Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University（燕山大学理学院河北省微观材料物理重点实验室）；Beijing Computational Science Research Center（北京计算科学研究中心）
Interplay of Magnetism and Topological Superconductivity in Bilayer Kagome Metals
二元金属间化合物材料$M_3$ Sn $_2$（$M$ = 3d过渡金属）呈现出一类新的强相关系统，其自然地允许磁性和金属性的相互作用。使用第一性原理计算，我们确认，散装铁$_3$锡$_2$是一个铁磁金属，并显示$M$ = Ni和Cu是具有非平凡的能带结构的顺磁性金属。专注于Fe $_3$ Sn $_2$，以了解在实验相关的原子薄的单kagome双层增强相关的效果，我们的从头计算结果表明，尺寸限制自然暴露的平坦性能带结构与双层kagome几何形状在所得的铁磁陈金属。我们使用一个多级的最小建模的磁性带逐渐接近费米能量。这有效地捕获了陈金属的物理特性，在材料相关参数范围内具有非零异常霍尔响应，以及自旋极化带的可能超导不稳定性，从而导致拓扑超导体。
Spectroscopic origin of giant anomalous Hall effect in an interwoven magnetic kagome metal
Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）；ShanghaiTech University（上海科技大学）；Oak Ridge National Laboratory（橡树岭国家实验室）；Rutgers University（罗格斯大学）；Weizmann Institute of Science（魏茨曼科学研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Chinese Academy of Sciences（中国科学院）；Beijing National Laboratory for Condensed Matter Physics（北京凝聚态物理国家研究中心）；Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；Stanford University（斯坦福大学）；Wuhan University（武汉大学）；University of Oxford（牛津大学）；Songshan Lake Materials Laboratory（松山湖材料实验室）
Precompression engineering of metal-insulator transition and magnetism in designed breathing kagome systems
School of Physics and Astronomy, and Key Laboratory of Multiscale Spin Physics (Ministry of Education), Beijing Normal University（北京师范大学物理与天文学院，多尺度自旋物理教育部重点实验室）；College of Physics, Hebei Normal University, and Hebei Advanced Thin Films Laboratory（河北师范大学物理学院，河北省先进薄膜实验室）
