Altermagnetic spin textures: Emergent electrodynamics, quantum geometry, and probes
Hearne Institute of Theoretical Physics, Department of Physics & Astronomy, Louisiana State University（路易斯安那州立大学物理与天文学系希恩理论物理研究所）；Institute for Theoretical Physics III, University of Stuttgart（斯图加特大学理论物理第三研究所）
Emergent electrodynamics arising from spatially and temporally varying magnetic textures provides a framework for spin control in quantum materials. While this principle is established for ferromagnetic and antiferromagnetic textures, its consequences for altermagnets -- magnetic orders with vanishing net magnetization but finite spin splitting -- remain largely unexplored. In this work, we develop an effective low-energy theory of itinerant electrons coupled to smoothly varying altermagnetic spin textures. In the adiabatic regime, we show that altermagnetic textures generate additional emergent electromagnetic fields and quantum-geometric effects that are absent in conventional magnetic systems. These effects include emergent Zeeman fields that encode the structure of the altermagnetic order parameter, enabling local spin manipulation and a way to distinguish different altermagnetic orders. Moreover, we demonstrate a quantum-metric-induced, spin-dependent electron lensing effect that provides a mechanism for spin filtering, and discuss the local admixture of effective odd-parity magnetic components. Our results suggest that textured altermagnets could serve as a versatile resource for spintronics functionalities and a probe of altermagnetism.
Emergent altermagnetism at surfaces of antiferromagnets: full symmetry classification and material identification
Johannes Gutenberg University Mainz（约翰内斯·古腾堡美因茨大学）；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）；Texas A&M University（德克萨斯农工大学）；University of Münster（明斯特大学）
Altermagnetic spin textures coupled to superconductors: Domain wall spin-triplet superconductivity and supercurrent-induced torques
Hearne Institute of Theoretical Physics, Department of Physics & Astronomy, Louisiana State University（路易斯安那州立大学物理与天文学系赫恩理论物理研究所）；Institute for Theoretical Physics III, University of Stuttgart（斯图加特大学理论物理第三研究所）
研究与传统 s 波超导体耦合的交变磁体中库珀对形式，考虑交变磁序参量空间不均匀性，发现超导性受交变磁畴影响，有三重态热点等，还存在超电流与交变磁序的相互作用，为相关研究提供独特机会。
Theory of optical axion electrodynamics and application to the Kerr effect in topological antiferromagnets
磁电介质中的涌现轴子电动力学有望为利用电磁场检测和控制材料性质提供新的途径。然而，尽管人们对其进行了十多年的深入研究，但其理论认识仍然主要局限于静态极限。在这里，我们介绍一个理论的轴子电动力学在一般频率。通过光学表面霍尔电导率与光学轴子磁电耦合的关系，定义了一个合适的光学轴子磁电耦合，并给出了在晶格系统中计算光学轴子磁电耦合的方法。通过采用我们的公式，我们表明，轴子电动力学可以导致显着的克尔效应在薄膜反铁磁体的波长似乎太长，以解决空间调制的磁性。我们确定了克尔效应被抑制的波长尺度。我们的理论是特别相关的材料，如MnBi $_2$ Te $_4$，拓扑反铁磁体，其磁电响应在这里显示为主导的轴子贡献，即使在光学频率。
Multiple Topological Phases Controlled via Strain in Two-Dimensional Altermagnets
Xinjiang University（新疆大学）；Central South University（中南大学）；Leibniz Institute for Solid State and Materials Research, IFW Dresden（德累斯顿亥姆霍兹固体与材料研究所）；The Hong Kong University of Science and Technology（香港科技大学）
Intrinsic longitudinal spin-conductivity from ferroaxial spin-symmetry breaking
University of Wisconsin–Milwaukee（威斯康星大学密尔沃基分校）；University of Minnesota（明尼苏达大学）；The University of Tokyo（东京大学）；Hokkaido University（北海道大学）；RIKEN Center for Emergent Matter Science（理化学研究所新兴物质科学中心）
