Discerning ground state and photoemission-induced spin textures in altermagnetic $α$-MnTe
École Polytechnique Fédérale de Lausanne（洛桑联邦理工学院）；Paul Scherrer Institut（保罗谢勒研究所）；University of West Bohemia（西波希米亚大学）；University of Nottingham（诺丁汉大学）；Lund University（隆德大学）；Czech Academy of Sciences（捷克科学院）；Max Planck Institute for the Physics of Complex Systems（马克斯·普朗克复杂系统物理研究所）；Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）
D. A. Usanov, S. W. D'Souza, A. Dal Din, J. Krempaský, F. Guo, O. J. Amin, C. Polley, M. Leandersson, G. Carbone, B. Thiagarajan, T. Jungwirth, L. Šmejkal, J. M… 展开作者
D. A. Usanov, S. W. D'Souza, A. Dal Din, J. Krempaský, F. Guo, O. J. Amin, C. Polley, M. Leandersson, G. Carbone, B. Thiagarajan, T. Jungwirth, L. Šmejkal, J. Minár, P. Wadley, J. H. Dil
The recently discovered class of altermagnets provide a physical realization of an unconventional compensated magnetic phase with a higher partial-wave type of ordering, reminiscent of unconventional superfluid phases. Their stability under normal conditions has sparked significant research interest, spanning fields from spintronics to topological and correlated quantum materials. Spin- and angle-resolved photoemission spectroscopy (SARPES) has great promise to resolve the momentum-dependent spin textures, which are intricately interweaved with the altermagnetic direct space spin order. Using the relativistic $d$-wave-like collinear spin polarization on one of the non-relativistic nodal surfaces of the altermagnetic band structure of $α$-MnTe as an example, we here identify and resolve the challenges associated with (S)ARPES studies on altermagnets. We focus particularly on the role of photoemission-induced electron polarization and the coupling between light and the Néel vector of a magnetic domain. Our findings reveal an atypical behaviour of photoemission selection rules while using linearly-polarized light. Our methods allow to distinguish polarization of photoelectrons originating from the sample's ground state spin texture, on one hand, and from the photoemission process, on the other hand. Our experimental results are supported by a combination of ab initio band-structure and 1-step photoemission calculations.
Observation of Altermagnetic Order Switching in Bulk MnTe by Polarized Neutron Diffraction
Institute for Solid State Physics, the University of Tokyo（东京大学固体物理研究所）；RIKEN Center for Emergent Matter Science (CEMS)（理化学研究所新兴物质科学中心）；Institute of Materials Structure Science, High Energy Accelerator Research Organization（高能加速器研究机构物质结构科学研究所）；Trans-scale Quantum Science Institute, the University of Tokyo（东京大学跨尺度量子科学研究所）
Magnetic Field Control of the Néel Vector and Magnon Visibility in Altermagnetic MnTe
Institut Laue-Langevin (ILL)（劳厄-朗之万研究所）；California Institute of Technology（加州理工学院）；University of Michigan（密歇根大学）；University of South Florida（南佛罗里达大学）；European Spallation Source (ESS)（欧洲散裂源）
Nanoscale electronic variations in altermagnetic $α$-MnTe
School of Engineering & Applied Sciences, Harvard University（哈佛大学本科院）；Department of Physics, Harvard University（哈佛大学物理系）；Materials Science & Technology Division, Physical Sciences Directorate, Oak Ridge National Lab（橡树岭国家实验室物理科学部材料科学与技术分部）
Pseudo-Goldstone mode in altermagnetic $α$-MnTe: high-field electron spin resonance studies
Helmholtz-Zentrum Dresden-Rossendorf (HZDR)（德累斯顿-罗森多夫亥姆霍兹中心）；Technische Universität Dresden（德累斯顿工业大学）；University of Leipzig（莱比锡大学）；Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）
Control of band structure in the altermagnetic candidate MnTe by temperature and strain
The University of Osaka（大阪大学）；Institute for Molecular Science（分子科学研究所）；The Institute for Solid State Physics, The University of Tokyo（东京大学固体物理研究所）；Institute for Chemical Research, Kyoto University（京都大学化学研究所）；Sogang University（西江大学）
Giant spontaneous Kerr effect and its self-doping dependence in altermagnetic MnTe
University of California, Irvine（加州大学尔湾分校）；Pohang University of Science and Technology（浦项科技大学）；U.S. Naval Research Laboratory（美国海军研究实验室）；Rutgers University（罗格斯大学）；National TsingHua University（国立清华大学）
Conductivity scaling of the anomalous Hall effect in the altermagnetic semiconductor α-MnTe
University of Notre Dame（圣母大学）；U.S. Naval Research Laboratory（美国海军研究实验室）；Stavropoulos Center for Quantum Matter, University of Notre Dame（圣母大学斯塔夫罗普洛斯量子物质中心）；Northeastern University（东北大学）；Quantum Materials and Sensing Institute, Northeastern University Innovation Campus（东北大学创新校区量子材料与传感研究所）；Synchrotron SOLEIL（SOLEIL同步辐射光源）；AGH University of Krakow（克拉科夫AGH科技大学）；Oak Ridge National Laboratory（橡树岭国家实验室）
Loss of altermagnetic order and smooth restoration of Kramers' spin degeneracy with increasing temperature in CrSb and MnTe
H.H. Wills Physics Laboratory, University of Bristol（布里斯托大学 H.H. 威尔斯物理实验室）；Department of Physics, University of Warwick（华威大学物理系）；Institute for Theoretical Physics, Johannes Keppler University Linz（林茨约翰内斯·开普勒大学理论物理研究所）；Donostia International Physics Center（圣塞巴斯蒂安国际物理中心）；Max-Planck-Institut für Mikrostrukturphysik（马克斯·普朗克微结构物理研究所）
Thermally-driven reorientation of the Néel vector in altermagnetic MnTe
PSI Center for Neutron and Muon Sciences（瑞士保罗谢勒研究所中子与μ子科学中心）；Faculty of Mathematics and Physics, Charles University（布拉格查理大学数学与物理学院）；Institute of Physics, Czech Academy of Sciences（捷克科学院物理研究所）；Department of Condensed Matter Physics, Faculty of Science, Masaryk University（布尔诺马萨里克大学理学院凝聚态物理系）；School of Physics and Astronomy, University of Nottingham（诺丁汉大学物理与天文学学院）；PSI Center for Photon Science（瑞士保罗谢勒研究所光子科学中心）；Institut de Physique, École Polytechnique Fédérale de Lausanne（洛桑联邦理工学院物理研究所）
Influence of the Néel vector on the bulk electronic structure of MnTe measured from the $(1 \bar1 00)$ surface
Ecole Polytechnique Federale de Lausanne（洛桑联邦理工学院）；Institute of Physics, Czech Academy of Sciences（捷克科学院物理研究所）；MAX IV Laboratory, Lund University（隆德大学MAX IV实验室）；Faculty of Mathematics and Physics, Charles University（查理大学数学与物理学院）；Max Planck Institute for the Physics of Complex Systems（马克斯·普朗克复杂系统物理研究所）；Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）；School of Physics and Astronomy, University of Nottingham（诺丁汉大学物理与天文学学院）；Center for Science and Innovation in Spintronics, Tohoku University（东北大学自旋电子学科学与创新中心）；Institut de Physique, École Polytechnique Fédérale de Lausanne（洛桑联邦理工学院物理研究所）
Aarhus University（奥胡斯大学）；Jozef Stefan Institute（约瑟夫·斯蒂芬研究所）；Silicon Austria Labs（硅奥地利实验室）；National Institute for Materials Science (NIMS)（物质材料研究机构）；Tohoku University（东北大学）
研究 MnTe 单晶，用自熔剂法合成，通过多种测量方法研究其结构与性质，发现晶体在特定温度下有复杂畴动力学及安德森绝缘态，虽与缺 Te 样品不同，但交替磁性标志仍存在且幅度降低。
Plaid-Like Spin Splitting and Chirality of Magnon Bands in Antiferromagnetic MnTe$_2$
Sejong University（世宗大学）；Korea Advanced Institute of Science and Technology (KAIST)（韩国科学技术院）；Sungkyunkwan University（成均馆大学）；Institute of Physics, Academia Sinica（中央研究院物理研究所）
Observation of Switchable Chiral Magnons in an Altermagnet
Institute for Solid State Physics, the University of Tokyo（东京大学固体物理研究所）；Neutron Scattering Division, Oak Ridge National Laboratory（橡树岭国家实验室中子散射部）；Institut Laue-Langevin（朗之万研究所）；ISIS Neutron and Muon Source, Rutherford Appleton Laboratory（卢瑟福·阿普尔顿实验室ISIS中子和μ子源）；Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory（布鲁克海文国家实验室凝聚态物理与材料科学部）；Institute of Materials Structure Science, High Energy Accelerator Research Organization（高能加速器研究机构物质结构科学研究所）；Trans-scale Quantum Science Institute, the University of Tokyo（东京大学跨尺度量子科学研究所）
