Altermagnetism exhibits zero net magnetization and spin-splitting electronic structure. The interplay between altermagnetism and topological physics becomes an important topic in the condensed matter physics. In this letter, we propose that the altermagnet Ce4Sb3 hosts Dirac fermions through first-principles calculations and tight-binding model analysis. When subjected to external magnetic field, the altermagnet Ce4Sb3 change from altermagnetic state to ferromagnetic state. Accompanied with magnetic order transition, the four-fold degenerate Dirac points are transited into sextuple degenerate points. Especially, spin-orbital coupling effect has little influence about the Dirac fermions. The topological phases in the altermagnetic state may hold the exotic spin-splitter torque and remarkable nonlinear transport effect. Our work paves the way for exploring the interplay between altermagnetism and non-trivial topological phase.
Electrical manipulation and detection of perpendicular altermagnetic order via proximitized Dirac semimetal
National University of Singapore（新加坡国立大学）；NIST Center for Neutron Research, National Institute of Standards and Technology（美国国家标准与技术研究院中子研究中心）；ISIS Facility, STFC Rutherford Appleton Laboratory（STFC拉瑟福德阿普尔顿实验室ISIS设施）；Institute of Materials Research & Engineering, Agency for ScienceTechnology & Research (A*STAR)（科技研究局材料研究与工程研究所）；National University of Singapore (Chong Qing) Research Institute（新加坡国立大学重庆研究院）
Dirac edge states as signature of two-dimensional altermagnetic topological crystalline phase
Universitá degli Studi di Milano（米兰大学）；Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所）；International Research Centre Magtop, Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所磁顶国际研究中心）；SPIN-CNR, UOS Salerno（萨莱诺统一办公室自旋-意大利国家研究委员会）；Consiglio Nazionale delle Ricerche (CNR-SPIN)（意大利国家研究委员会（CNR-SPIN））
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）
Dirac points and Weyl phase in a honeycomb altermagnet
Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, State Key Laboratory of Optoelectronic Materials and Technologies, Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University（中山大学物理学院）
Projectively implemented altermagnetism in an exactly solvable quantum spin liquid
Technical University of Munich（慕尼黑工业大学）；Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）；University of Cologne（科隆大学）；Imperial College London（帝国理工学院）
Spin-degenerate bulk bands and topological surface states associated with Dirac nodal lines in RuO2
Tohoku University（东北大学）；Osaka University（大阪大学）；Center for Spintronics Research Network (CSRN), Osaka University（大阪大学自旋电子学研究网络中心）；Advanced Institute for Materials Research (WPI-AIMR), Tohoku University（东北大学材料高等研究院）；Center for Science and Innovation in Spintronics (CSIS), Tohoku University（东北大学自旋电子学科学与创新中心）；Toyota Riken–Kyoto University Research Center (TRiKUC)（丰田理研京都大学研究中心）；Indian Institute of Technology (IIT) Kanpur（坎普尔印度理工学院）；Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)（高能加速器研究机构物质结构科学研究所）；National Institutes for Quantum Science and Technology (QST)（量子科学技术研究开发机构）；Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University（东北大学先进材料跨学科研究所）
Pressure-induced phase switching of the Shubnikov de Haas oscillations in molecular Dirac fermion system $α-$(BETS)$_{2}$I$_{3}$
本文报道了1.7 K时准二维分子导体$α-$（BETS）$_{2}$ I $_{3}$ [BETS：bis（ethylenedithio）tetraselenafulvalene]在聚酰亚胺薄膜上的Shubnikov de Haas（SdH）振荡。从SdH相因子，我们实验验证了该材料在压力下是在狄拉克费米子相。$α-$（BETS）$_{2}$ I $_{3}$处于强关联绝缘相和狄拉克费米子相之间的相变附近，是常压分子狄拉克费米子系统的可能候选者。然而，SdH振荡表明，Berry相在环境压力下为零。在压力下，当金属-绝缘体交叉几乎被抑制在$\sim$ 0.5 GPa时，出现$π$ Berry相。结果对比的先驱分子狄拉克费米子系统$α-$（BEDT-TTF）$_{2}$ I $_{3}$ [BEDT-TTF：双（亚乙基二硫代）四硫富瓦烯]狄拉克费米子和半导体行为同时观察。
Strain-induced valley polarization, topological states, and piezomagnetism in two-dimensional altermagnetic V$_2$Te$_2$O, V$_2$STeO, V$_2$SSeO, and V$_2$S$_2$O
Band topology and symmetry-driven magneto-optical response in two-dimensional d-wave altermagnets with staggered spin-orbit coupling
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）；Institute of Theoretical Physics, Jagiellonian University（雅盖隆大学理论物理研究所）
Near-degenerate competing magnetic orders in EuAgAs: a tunable route to altermagnetism
University of Notre Dame（圣母大学）；Stavropoulos Center for Complex Quantum Matter, University of Notre Dame（圣母大学斯塔夫罗普洛斯复杂量子物质中心）；Center for Nanophase Materials Sciences, Oak Ridge National Laboratory（橡树岭国家实验室纳米材料科学中心）；Rutgers University（罗格斯大学）；Neutron Scattering Division, Oak Ridge National Laboratory（橡树岭国家实验室中子散射部）；George Mason University（乔治梅森大学）
