Correlated topological band structures of the kagome altermagnets Mn$_3X$ ($X=$ Sn, Ge, Ga)
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院);Institute of Quantum Materials and Physics, Henan Academy of Sciences(河南省科学院量子材料物理研究所);Institute for Applied Physics, University of Science and Technology Beijing(北京科技大学应用物理学院);Songshan Lake Materials Laboratory(松山湖材料实验室)
The interplay of topological band structures and electronic correlations may lead to novel quantum phenomena with potential applications. First-principles calculations are critical for guiding experimental discoveries and interpretations, but often fail if electronic correlations cannot be properly treated. Here we show that this issue occurs also in the kagome altermagnets Mn$_3X$ ($X=$ Sn, Ge, Ga), which were believed to exhibit large anomalous Hall effect due to topological band structures with Weyl nodes near the Fermi energy. Our systematic investigations reveal critical importance of beyond-DFT treatments on three key aspects of their magnetic, electronic, and topological properties: (1) establishment of noncollinear altermagnetic orders, (2) weakly renormalized band structures in excellent agreement with angle-resolved photoemission spectroscopy experiment, and (3) sensitive tuning of the Weyl nodes. Our work provides a unified basis for understanding topological properties of the Mn$_3X$ family, which challenges previous experimental interpretations based on DFT band structures and predicts potentially higher anomalous Hall conductivity in Mn$_3$Ga under electron doping. This underscores the importance of a correlation-aware framework beyond DFT in understanding topological magnetic materials.
Orbital altermagnetism on the kagome lattice and possible application to $A$V$_3$Sb$_5$
The Grainger College of Engineering, University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校格雷恩格工程学院);Anthony J. Leggett Institute for Condensed Matter Theory, The Grainger College of Engineering, University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校格雷恩格工程学院安东尼·J·利盖特凝聚态理论研究所);Department of Chemical Engineering and Materials Science, University of Minnesota(明尼苏达大学化学工程与材料科学系)
Altermagnetism, Kagome Flat Band, and Weyl Fermion States in Magnetically Intercalated Transition Metal Dichalcogenides
University of Missouri(密苏里大学);National Cheng Kung University(国立成功大学);Center for Quantum Frontiers of Research and Technology (QFort)(量子前沿研究与技术中心);National Center for Theoretical Sciences(国家理论科学中心)
Berry-Curvature Activation by Orbital Flux in a Kagome Altermagnet
International Research Centre Magtop, Institute of Physics, Polish Academy of Sciences(波兰科学院物理研究所);Department of Physics, University of Guilan(吉兰大学物理系)
Correlation-Driven Orbital Order Realizes 2D Metallic Altermagnetism
Indian Institute of Technology Kanpur(坎普尔印度理工学院);Johannes Gutenberg Universität Mainz(美因茨约翰内斯·古腾堡大学);National Institute of Science Education and Research(国家科学教育与研究所)
Extreme Strain Controlled Correlated Metal-Insulator Transition in the Altermagnet CrSb
KTH Royal Institute of Technology(瑞典皇家理工学院);Leibniz Institute for Solid State and Materials Research, IFW Dresden(德累斯顿IFW莱布尼茨固体与材料研究所);Center for High Pressure Science and Technology Advanced Research(高压科学与技术前沿研究中心);Politecnico di Milano(米兰理工大学);SLAC National Accelerator Laboratory(斯坦福直线加速器国家实验室);Diamond Light Source(英国钻石光源);Lund University(隆德大学);Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所)
Impact of strong electronic correlations on altermagnets: the case of NiS2
Center for Computational Quantum Physics (CCQ), Flatiron Institute(平顿研究所计算量子物理中心);Department of Chemical Engineering and Materials Science, University of Minnesota(明尼苏达大学化学工程与材料科学系);Collège de France(法兰西公学院);CPHT, CNRS, École Polytechnique, IP Paris(巴黎综合理工学院CNRS CPHT实验室);DQMP, University of Geneva(日内瓦大学DQMP);Department of Physics, The Grainger College of Engineering, University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校格雷英工程学院物理学系);Anthony J. Leggett Institute for Condensed Matter Theory, The Grainger College of Engineering, University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校格雷英工程学院安东尼·J·雷格特凝聚态理论研究所)
Signatures of Weyl fermion annihilation in a correlated kagome magnet
量子物质中拓扑态的操纵是基础物理学和下一代量子技术的重要追求。本文报道了用高分辨光电子能谱观测到的可果美自旋轨道半金属Co $_3$ Sn $_2$ S $_2$中外尔费米子的磁操纵。我们证明了交换崩溃的自旋轨道缺口铁磁外尔环顺磁狄拉克环下的磁秩序的抑制。我们进一步观察到,拓扑费米弧消失在顺磁相,这表明湮灭的交换分裂外尔点。我们的研究结果表明,磁交换坍缩自然驱动外尔费米子湮灭,相关的序参量下的工程拓扑打开了新的机会。
Antiferromagnetic Dimers in the Parent Phase of a Correlated Kagome Superconductor
Zhejiang University(浙江大学);Hangzhou Normal University(杭州师范大学);Zhejiang University of Technology(浙江工业大学);Japan Synchrotron Radiation Research Institute(日本同步辐射研究所);RIKEN SPring-8 Center(理化学研究所SPring-8中心)
Evidence of orbit-selective electronic kagome lattice with planar flat-band in correlated paramagnetic YCr6Ge6
kagome晶格的电子性质近年来引起了人们的极大关注。结合相消干涉和狄拉克锥型色散引起的平带现象,理论上讨论了大量的奇异现象。电子kagome晶格的物质实现是理解kagome物理和实现新量子相的关键一步。在这里,结合角分辨光电子能谱,运输测量和第一原理计算,我们暴露了一个平面平带在顺磁性YCr 6 Ge 6作为一个典型的签名的电子kagome晶格。我们发现平面平带是由d_(z^2)电子在可果梅面内跳跃产生的,这种跳跃被相消干涉所禁止。另一方面,d_(x^2-y^2)和d_xy带的相消干涉和平坦性可能由于附加的面内跳跃项而被分解,但在化学势附近保留了Dirac锥型色散。我们明确揭示了轨道特性在具有过渡金属层的块体材料中实现电子可格构晶格中起着至关重要的作用。顺磁YCr 6 Ge 6为理解电子kagome晶格的本征性质及其与Cr-3d电子的自旋轨道耦合和电子关联的相互作用提供了一个机会,并且免于由kagome平面中离子的强局域矩引起的复杂性。
Exotic Surface Stripe Orders in Correlated Kagome Metal CsCr3Sb5
Sun Yat-sen University(中山大学);Chinese Academy of Sciences(中国科学院);Dalian University of Technology(大连理工大学);ShanghaiTech University(上海科技大学);Shanghai Advanced Research Institute, Chinese Academy of Sciences(中国科学院上海高等研究院);Songshan Lake Materials Laboratory(松山湖材料实验室)
Anomalous magnetotransport in a non-collinear correlated kagome ferromagnet MgMn6Sn6
S. N. Bose National Centre for Basic Sciences(S.N. 玻色基础科学国家中心);Max Planck Institute for Chemical Physics of Solids(马克斯·普朗克固体化学物理研究所);ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory(ISIS中子与μ子源,科学与技术设施委员会,拉瑟福德阿普尔顿实验室);School of Physical Sciences, Indian Institute of Technology Goa(印度果阿理工学院物理科学学院)
Orbital-selective band evolution and out-of-plane correlation in the FeGe-family kagome antiferromagnet ScFe$_6$Ge$_6$
Seoul National University(首尔大学);ShanghaiTech University(上海科技大学);University of Science and Technology of China(中国科学技术大学);Sejong University(世宗大学);Korea Institute of Science and Technology(韩国科学技术院);National Institutes for Quantum Science and Technology(量子科学技术研究机构);Shanghai Advanced Research Institute, Chinese Academy of Sciences(中国科学院上海高等研究院)
Coexisting Kagome and Heavy Fermion Flat Bands in YbCr$_6$Ge$_6$
Sungkyunkwan University(成均馆大学);Seoul National University(首尔大学);Yale University(耶鲁大学);National Synchrotron Light Source II, Brookhaven National Laboratory(美国国家同步辐射光源二号,布鲁海文国家实验室);Pohang Accelerator Laboratory, Pohang University of Science and Technology(浦项加速器实验室,浦项科技大学);Sookmyung Women’s University(淑明女子大学);Kyung Hee University(庆熙大学)
Splitting of electronic spectrum in paramagnetic phase of itinerant ferromagnets and altermagnets
Moscow Institute of Physics and Technology(莫斯科物理技术学院);M. N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences(俄罗斯科学院乌拉尔分校 M.N. 米凯耶夫金属物理研究所)
Orbital-specific Itinerancy and Localization in a Kagome Magnet
Institute of Metal Physics(金属物理研究所);Ural Federal University(乌拉尔联邦大学);National Synchrotron Radiation Research Center(国家同步辐射研究中心);National Tsing Hua University(国立清华大学);Rutgers University(罗格斯大学)
Many-Body Amplification of Ligand Instabilities Driving Verwey-Type Transitions in Altermagnet CsCr$_2$S$_2$O
University of Science and Technology of China(中国科学技术大学);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Cornerstone科学实验室)
Correlated charge order intertwined with time-reversal symmetry-breaking nodal superconductivity in the dual flat band kagome superconductor CeRu$_{3}$Si$_{2}$
PSI Center for Neutron and Muon Sciences(保罗谢尔研究所中子与μ子科学中心);Physik-Institut, Universität Zürich(苏黎世大学物理学院);Department of Quantum Matter Physics, University of Geneva(日内瓦大学量子物质物理系);TU Dortmund University, Department of Physics(多特蒙德工业大学物理系);Research Center Future Energy Materials and Systems (RC FEMS)(未来能源材料与系统研究中心)
Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Metal GdV${_6}$Sn${_6}$
基于过渡金属的kagome材料是研究新型拓扑电子态和相关现象的前沿。迄今为止,在理想化的二维kagome晶格中,拓扑非平凡的狄拉克表面态(TDSS)还没有被明确观察到,TDSS和范霍夫奇点(VHS)的操纵仍然在很大程度上未被探索。在这里,我们揭示了TDSS起源于Z ${_2}$体拓扑结构,并确定了多个VHS附近的费米能级($\textit{E}$ ${_F}$)的磁性可果美材料GdV ${_6}$ Sn ${_6}$。利用原位表面沉积钾,我们成功地实现了对TDSS和VHS的操控。TDSS的狄拉克点可以从上到下($\textit{E}$ ${_F}$)进行调整,这会逆转费米表面处自旋织构的手性。这些结果建立了GdV ${_6}$ Sn ${_6}$作为一个迷人的平台,研究非平凡的拓扑结构,磁性和相关效应本地戈薇晶格。他们还提出了基于可果美材料的自旋电子器件的潜在应用。
Charge order through crystallization of Frenkel excitons: realization in kagome metals
School of Physics and Astronomy and Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交通大学物理与天文学院及李政道研究所);Department of Materials Science and Metallurgy, University of Cambridge(剑桥大学材料科学与工程系);Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education)(人工结构与量子控制教育部重点实验室);Shanghai Branch, Hefei National Laboratory(合肥国家实验室上海分部)
Exploring the apparent violation of the Mott relation in a noncentrosymmetric kagome ferromagnet
Virginia Tech(弗吉尼亚理工大学);Virginia Tech National Security Institute(弗吉尼亚国家安全研究所);Virginia Tech Center for Quantum Information Science and Engineering(弗吉尼亚量子信息科学与工程中心);University of Virginia(弗吉尼亚大学);Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室);University of California, Davis(加州大学戴维斯分校)
Massive Dirac fermions in a ferromagnetic kagome metal
kagome晶格是一个由角共享三角形组成的二维网络,被称为奇异量子磁态的平台。理论工作已经预测,kagome晶格也可能拥有狄拉克电子态,这可能导致拓扑和陈氏绝缘相,但这些都逃避了实验检测到日期。在这里,我们研究的d-电子kagome金属Fe $_3$ Sn $_2$设计支持大规模狄拉克费米子在铁磁秩序的存在下。我们观察到一个温度无关的固有的异常霍尔电导率持续高于室温暗示突出的Berry曲率从时间反演打破电子带的戈薇平面。使用角分辨光电发射,我们发现一对准二维狄拉克锥附近的费米能级与30 meV的质量间隙,占贝里曲率诱导的霍尔电导率。我们发现,这种行为是一个结果的基本对称性的双层kagome晶格在铁磁态原子自旋轨道耦合。这份报告提供了铁磁戈薇金属的第一个证据和一个例子,新兴的拓扑电子性质的相关电子系统。这提供了洞察最近发现的奇异的电子行为在kagome晶格反铁磁体,并可能提供一个垫脚石走向分数拓扑量子态的晶格模型实现。
Evaluating the Structural Basis for Polar Altermagnet Candidate Ca$_{3}$(Ru,Ti)$_{2}$O$_{7}$
The Pennsylvania State University(宾夕法尼亚州立大学);Nanjing University(南京大学);Dartmouth College(达特茅斯学院);Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory(斯坦福材料能源科学研究所,SLAC国家加速器实验室);Argonne National Lab(阿贡国家实验室)
A Kagome-Derived Mosaic Lattice Family A3V9Te13 (A = Cs, Rb) with Tunable Strong Electronic Correlations
Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交大李政道研究所);School of Physics and Astronomy, Shanghai Jiao Tong University(上海交通大学物理与天文学院);Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology(南方科技大学量子科学工程学院);International Quantum Academy(国际量子科学院)
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。
Record-high Mobility and Extreme Magnetoresistance on Kagome-lattice in Compensated Semimetal Ni3In2S2
kagome晶格晶体具有许多有趣的性质,包括阻挫磁性、电荷序、拓扑态、超导电性和相关现象。为了获得用于电子和自旋电子学应用的高性能卡戈梅晶格化合物,需要仔细调整能带结构。本文采用输运测量、角分辨光电子能谱和从头算方法研究了Kagome点阵晶体Ni 3 In 2S 2的电子结构。传输测量显示Ni 3 In 2S 2作为补偿半金属,具有创纪录的高载流子迁移率(空穴和电子的~8683 cm 2 V-1 S-1和7356 cm 2 V-1 S-1)和极端的磁阻(在2 K和13 T时为15518%)。这些特殊的性质很好地解释了它的能带结构与间接的间隙,小的电子/空穴口袋和大带宽的3d电子的Ni的kagome晶格。这项工作表明,晶体场和掺杂作为关键的调谐旋钮,以优化在kagome晶格晶体中的输运性质。我们的工作为kagome晶格半金属在电子学和自旋电子学方面的应用提供了材料基础和优化途径。
Giant Room-Temperature Third-Order Electrical Transport in a Thin-Film Altermagnet Candidate
School of Materials Science and Engineering, Beihang University(北京航空航天大学材料科学与工程学院);School of Physics, Beihang University(北京航空航天大学物理学院);State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation, Beihang University(北京航空航天大学热带海洋工程材料与材料评价国家重点实验室);National Synchrotron Radiation Laboratory, University of Science and Technology of China(中国科学技术大学国家同步辐射实验室);Anhui Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences(中国科学院合肥物质科学研究院高磁场中心安徽低能量子材料与器件重点实验室)