Altermagnets exhibit nonrelativistic spin splitting due to the breaking of time-reversal symmetry and have been garnering significant attention as promising materials for spintronic applications. In contrast, conventional antiferromagnets without spin splitting seem not to have any symmetry breaking and have drawn less attention. However, we show that conventional antiferromagnets with a nonzero propagation vector (Q vector) bring about nontrivial symmetry breakings. The incompatibility between the Q vector and nonsymmorphic symmetry leads to macroscopic symmetry breaking without lifting spin degeneracy. Moreover, the hidden altermagnetic spin splitting in the electronic structure gives rise to various emergent responses. To examine our prediction, we perform first-principles calculations for MnS2 and investigate its multiferroic properties, such as nonlinear transport and optical activity. Our findings reveal unique properties in conventional antiferromagnets, providing another perspective for designing spintronic materials.
University of Jinan（济南大学）；Institute for Superconducting and Electronic Materials, Faculty of Engineering and Information Sciences, University of Wollongong（伍伦贡大学工程与信息科学学院超导与电子材料研究所）
Altermagnetic type-II Multiferroics with Néel-order-locked Electric Polarization
National Laboratory of Solid State Microstructures, School of Physics, Nanjing University（南京大学固体微结构物理学院）；Jiangsu Key Laboratory of Artificial Functional Materials and Department of Materials Science and Engineering,Nanjing University（南京大学材料科学与工程系）；Collaborative Innovation Center of Advanced Microstructures, Nanjing University（南京大学先进微结构协同创新中心）；Center for Quantum Transport and Thermal Energy Science, School of Physics and Technology, Nanjing Normal University（南京师范大学物理科学与技术学院）
Nonrelativistic and Relativistic Contributions to Spin-Momentum Locking and Spin Photogalvanic Effect in an Altermagnetic Multiferroic
University of Milan-Bicocca（米兰比可卡大学）；Consiglio Nazionale delle Ricerche (CNR-SPIN)（意大利国家研究委员会）；Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所）；Ca’ Foscari University of Venice（威尼斯大学）
Coexistence of Altermagnetic and Compensated Ferrimagnetic Motifs in a Noncollinear Multiferroic
Institute of Materials Science, Technical University of Darmstadt（达姆施塔特工业大学材料科学研究所）；Physics Department and CSMB, Humboldt-Universität zu Berlin（柏林洪堡大学物理系和CSMB）；Department of Physics, Stockholm University（斯德哥尔摩大学物理系）；Leibniz Institute for Solid State and Materials Research Dresden（德累斯顿莱布尼茨固体与材料研究所）；Department of Physics, Birla Institute of Technology Mesra（米斯拉比尔拉理工学院物理系）；Suzhou Laboratory（苏州实验室）；Würzburg-Dresden Cluster of Excellence ctd.qmat（维尔茨堡-德累斯顿卓越集群ctd.qmat）；Institute of Theoretical Physics, Technische Universität Dresden（德累斯顿工业大学理论物理研究所）；Department of Chemistry and Physics of Materials, University of Salzburg（萨尔茨堡大学材料与化学物理系）
Altermagnetic Signatures and Topological Textures in Ultrathin Multiferroic BiFeO$_3$
Brown University（布朗大学）；Cornell University（康奈尔大学）；Rice University（莱斯大学）；Rice Advanced Materials Institute, Rice University（莱斯大学先进材料研究所）；MAX IV Laboratory（MAX IV实验室）；University of Arkansas（阿肯色大学）；Johannes Gutenberg-University Mainz（美因茨约翰内斯·古腾堡大学）；Oak Ridge National Laboratory（橡树岭国家实验室）；Max Planck Institute for the Physics of Complex Systems（马克斯·普朗克复杂系统物理研究所）；University of Augsburg（奥格斯堡大学）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）；University of California, Berkeley（加州大学伯克利分校）；Tel Aviv University（特拉维夫大学）；Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）；Czech Academy of Sciences（捷克科学院）；Kavli Institute at Cornell for Nanoscale Science, Cornell University（康奈尔纳米科学卡弗里研究所）；Leibniz-Institut für Kristallzüchtung（莱布尼兹晶体生长研究所）；Smalley-Curl Institute, Rice University（莱斯大学斯莫利-柯尔研究所）；Northeastern University（东北大学）
Electric susceptibility of antiferromagnetic multiferroics with cycloidal spin order at magnetoelectric effect associated with collinear component of spins
Electric field switching of altermagnetic spin-splitting in multiferroic skyrmions
Huazhong University of Science and Technology（华中科技大学）；Wuhan National High Magnetic Field Center（武汉国家强磁场中心）；China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong)（粤港澳大湾区量子科学中心（广东））；CIQTEK Co,. Ltd.（国仪量子技术有限公司）；Tsinghua University（清华大学）；Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences（中国科学院宁波材料技术与工程研究所）；Fudan University（复旦大学）
Colossal Type-II Multiferroic Polarization Driven by Collinear Spin Orders
Nanjing University of Science and Technology（南京理工大学）；School of Physics, Nanjing University（南京大学物理学院）；Collaborative Innovation Center of Advanced Microstructures, Nanjing University（南京大学先进微结构协同创新中心）；Hefei National Laboratory（合肥国家实验室）；Jiangsu Physical Science Research Center, Nanjing University（南京大学江苏省物理科学研究中心）
Above room temperature multiferroic tunnel junction with the altermagnetic metal CrSb
Huazhong University of Science and Technology（华中科技大学）；Florida State University（佛罗里达州立大学）；National High Magnetic Field Laboratory（国家强磁场实验室）；Charles University（查理大学）
Systematic display of the spin splitting in band structures of representative altermagnetic crystals
Rutgers University（罗格斯大学）；Addis Ababa Science and Technology University（亚的斯亚贝巴科学技术大学）；Università di Cagliari（卡利亚里大学）；University of Texas at Austin（德克萨斯大学奥斯汀分校）；Soongsil University（崇实大学）；Universidad Andres Bello（安德烈斯贝略大学）
Symmetry-Driven Unconventional Magnetoelectric Coupling in Perovskite Altermagnets: From Bulk to the Two-Dimensional Limit
Eastern Institute of Technology（宁波东方理工大学）；Ningbo Institute of Digital Twin, Eastern Institute of Technology（宁波东方理工大学数字孪生研究院）；Eastern Institute for Advanced Study, Eastern Institute of Technology（宁波东方理工大学高等研究院）；School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院）；School of Physical Science and Technology, Suzhou University of Science and Technology（苏州科技大学物理科学与技术学院）
Non-collinear Altermagnetic Phases in the Mott Insulator NiS$_2$
Leibniz Institute for Solid State and Materials Research（莱布尼茨固体与材料研究所）；Technische Universitat Dresden（德累斯顿工业大学）；Laboratoire Léon Brillouin, CEA, CNRS, Université Paris-Saclay（塞奈-萨克雷大学、法国原子能与替代能源委员会、法国国家科学研究中心勒昂布里渊实验室）；Université de Sherbrooke（舍布鲁克大学）；Donostia International Physics Center（圣塞巴斯蒂安国际物理中心）；Regroupement Québécois sur les Matériaux de Pointe (RQMP)（魁北克尖端材料研究联合体）
Crystal Symmetry Selected Pure Spin Photocurrent in Altermagnetic Insulators
School of Physics, Beijing Institute of Technology（北京理工大学物理学院）；Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (Ministry of Education), Beijing Institute of Technology（北京理工大学先进光电子量子架构与测量教育部重点实验室）；Shenzhen Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology（南方科技大学量子科学工程研究院及物理系）
Ferroelectricity driven by the non-centrosymmetric magnetic ordering in multiferroic TbMn_2O_5: a first-principles study
采用第一性原理计算研究了多铁性TbMn $_2$ O $_5$的基态结构、电子和磁性.结果表明，TbMn $_2$ O $_5$的铁电性是由非中心对称的磁有序驱动的，而没有引起自旋轨道耦合和非共线自旋.该化合物中的{ \it本征}电极化的强度计算为1187 $nC\cdot$ cm $^{-2}$，比以前认为的大一个数量级。
AlterSeeK-Path: Systematic construction of generalized band-structure paths for displaying altermagnetic spin splitting
Rutgers University（罗格斯大学）；Addis Ababa Science and Technology University（亚的斯亚贝巴科学与技术大学）；Università di Cagliari（卡利亚里大学）；University of Texas at Austin（德克萨斯大学奥斯汀分校）；Soongsil University（崇实大学）；Universidad Andres Bello（安德烈斯贝略大学）
Local multiferroic ordering at room temperature in collinear magnetoelectric antiferromagnets induced by flexo-Zeeman coupling
Helmholtz-Zentrum Dresden-Rossendorf e.V.（德累斯顿-罗森多夫亥姆霍兹中心）；Faculty of Physics of Dresden University of Technology（德累斯顿工业大学物理学院）；Helmholtz-Zentrum Berlin für Materialien und Energie（柏林亥姆霍兹材料与能源中心）；Department of Applied Physics, KTH Royal Institute of Technology（瑞典皇家理工学院应用物理系）
Atomic-Scale Observation of Symmetry Breaking in Altermagnetic MnTe
University of Washington（华盛顿大学）；University of Illinois Chicago（伊利诺伊大学芝加哥分校）；Uppsala University（乌普萨拉大学）；Rice University（莱斯大学）；Czech Academy of Sciences（捷克科学院）；Brno University of Technology（布尔诺理工大学）；University of Nottingham（诺丁汉大学）；Tohoku University（东北大学）；Pacific Northwest National Laboratory（太平洋西北国家实验室）
Strain-Tunable Shift Current and Magneto-Optical Kerr Effect in Multiferroic Altermagnet Fe2Mo3O8
Jilin University（吉林大学）；Suzhou Laboratory（苏州实验室）；Institute of Materials Science, Technology University of Darmstadt（达姆施塔特工业大学材料科学研究所）；University of Salzburg（萨尔茨堡大学）；College of Physics, Jilin University（吉林大学物理学院）
Quantum Dynamics of Multiferroic Helimagnets: a Schwinger-Boson Approach
我们研究的量子动力学/波动的摆线螺旋磁铁的Schwinger玻色子方法。与经典涨落形成鲜明对比的是，量子涨落本质上是共线的，这使得随着温度的降低，共线自旋密度波态略高于螺旋摆线态。从这个角度讨论了螺旋线的约化椭圆比、中子散射和红外吸收光谱等物理性质，并讨论了它们与准一维LiCu $_2$ O $_2$和LiCuVO $_4$的可能关系.
Dimension- and Facet-Dependent Altermagnetic Biferroics and Ferromagnetic Biferroics and Triferroics in CrSb
School of Physics Huazhong University of Science and Technology（华中科技大学物理学院）；Wuhan National High Magnetic Field Center Huazhong University of Science and Technology（华中科技大学武汉国家强磁场中心）
Topological spin textures in 2D altermagnetic chromium chalcogenides: Interplay between magnetic frustration and Dzyaloshinskii-Moriya interaction
Zhejiang Sci-Tech University（浙江理工大学）；Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation, Zhejiang Sci-Tech University（浙江量子态调控与光场操控重点实验室）
Disentangling Anomalous Hall Effect Mechanisms and Extra Symmetry Protection in Altermagnetic Systems
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及凝聚态物理北京国家实验室）；University of Chinese Academy of Sciences（中国科学院大学）；Condensed Matter Physics Data Center of Chinese Academy of Sciences（中国科学院凝聚态物理数据中心）
Dynamical magnetic susceptibility of non-collinear magnets: A novel KKR-based ab initio scheme and its application
Institute for Theoretical Physics, Johannes Kepler University Linz（林茨约翰内斯开普勒大学理论物理研究所）；Hamburg University of Applied Sciences（汉堡应用科学大学）；Max Planck Institute of Microstructure Physics（马克斯·普朗克微结构物理研究所）；Donostia International Physics Center (DIPC)（多诺斯蒂亚国际物理中心）
Experimental investigation of altermagnetic order in Cr-doped FeSb2
University of Michigan（密歇根大学）；PSI Center for Neutron and Muon Sciences（瑞士保罗谢尔研究所中子与缪子科学中心）；Oak Ridge National Laboratory（橡树岭国家实验室）；Michigan State University（密歇根州立大学）；Goethe-University Frankfurt（法兰克福歌德大学）
