主讲人：姚裕贵 教授（北京理工大学）
题目：Recent progress in anomalous Hall effect in ferromagnets and antiferromagnets
时间：2023年7月28日（星期五）上午9：00
地点：理工楼1226会议室
邀请人：高存绪
报告摘要：
The anomalous Hall effect (AHE) is a fundamental phenomenon related to magnetism in solid-state physics, in which a transverse voltage drop is induced by a longitudinal electric field [1, 2]. Although the effect was well known in ferromagnets for more than a century, it was recently found in antiferromagnets as well. In this talk, I will review the history and latest progress of the AHE in both ferromagnets and antiferromagnets. First, I will show that ferromagnetic MF3 (M = Pd, Mn) are high-quality nodal chain spin-gapless topological semimetals with 100% spin-polarized transport properties [3, 4]. The dominant intrinsic origin is found to originate entirely from the gapped nodal chains without the entanglement of any other trivial bands. The side-jump mechanism is predicted to be negligibly small, but the skew scattering enhances the intrinsic Hall and Nernst signals significantly. Second, I will present the spin-chirality-dependent anomalous Hall and Nernst effects in coplanar noncollinear antiferromagnets Mn3XN (X = Ga, Zn, Ag, and Ni) [5], as well as the topological magneto-optical effects and their quantization in noncoplanar antiferromagnets γ-FexMn1−x and K0.5RhO2 [6]. Beyond ferromagnetism and noncollinear antiferromagnets, collinear antiferromagnets with PT symmetry can surprisingly host the AHE, as well as other anomalous transport effects. Lastly, I will discuss an unconventional AHE induced by the in-plane magnetic field via the spin-canting effect in PT-symmetric antiferromagnetic systems, such as the well-known Dirac semimetal CuMnAs and a heterodimensional VS2-VS superlattice [7].
[1] Yao et al., PRL 92, 037204 (2004); PRB 75, 020401(R)(2007).
[2] Nagaosa et al., Rev. Mod. Phys. 82, 1539 (2010).
[3] Zhang et al., PRL 124, 016402 (2020).
[4] Zhou et al., PRL 129, 097201 (2022).
[5] Zhou et al., PRB 99, 104428 (2019); PRM 4, 024408 (2020).
[6] Feng et al., Nat. Commun. 11, 118 (2020); Yang et al., PRB 106, 174427 (2022).
[7] Cao et al., PRL 130, 166702 (2023); Zhou et al., Nature 46, 609 (2022).
个人简介：
姚裕贵，分别在南开大学、中科院上海光机所和力学所获得学士学位、光学硕士学位和力学博士学位。北京理工大学杰出教授、美国物理学会会士、长江学者、杰青、万人、国家重点研发计划项目首席科学家，享受政府特贴，连续5年入选科睿唯安全球“高被引科学家”名单，曾荣获国家自然科学奖、教育部自然科学奖、北京市自然科学奖、中国科学院杰出科技成就奖、北京市有突出贡献人才等奖项。作为院长，带领北理工物理学科入选国家一流学科建设名单。
研究领域为计算物理和凝聚态物理，发展了反常输运物理量与拓扑不变量的第一性原理计算方法，部分成果写进了国外流行教科书，是该领域开拓者之一；引领了硅烯等二维拓扑材料的研究，所提出的理论模型被冠名；完成了三维晶体中准粒子的分类并建立了百科，为搜寻和实现相关演生粒子提供了理论指导；发展了含能材料能量释放性能及感度快速检测技术，填补了相关GF领域技术空白。至今共发表SCI论文270余篇（含35篇PRL/X，17篇NATURE及子刊），在反常输运、硅烯、石墨烯、拓扑材料与物性等领域的研究成果具有重要国际影响，共被引2万次，10篇超过500次。
