报告题目: Chiral magneto-phonons induced from spin dynamics via magnetoelastic anisotropy
时间:2024年12月25日(周三)14:00 − 15:00
地点:九龙湖校区田家炳楼平星报告厅(南203)
主持人:林维维
报告摘要:
In this talk, I will share our recent work on chiral phonon-like excitations from the bond-dependent magnetoelastic couplings in the absence of out-of-plane magnetization and magnetic fields. By mapping the hybrid excitation to its phononic analog, we reveal the impact of the lattice symmetry on the origin of the chirality. In the example of a triangular lattice ferromagnet, we recognize that the system is equivalent to the class D of topological phonons, and show the tunable chirality and topology by an in-plane magnetic field. As a possible experimental probe, we evaluate the phonon magnetization and planar thermal Hall conductivity. Our study gives a new perspective on tunable topological and chiral excitations beyond the Raman spin-lattice coupling, suggesting possible applications of spintronics and phononics in various anisotropic magnets and/or Kitaev materials.
[1] B. Ma and G. A. Fiete, Phys. Rev. B 105, L100402 (2022).
[2] B. Ma, Z. D. Wang, and G. Chen, Phys. Rev. Lett. 133, 246604 (2024).
报告人简介:
马博文,香港大学量子研究院副研究员。2016年在中国科学技术大学近代物理系取得物理学本科学位,2021年在美国得克萨斯大学奥斯汀分校取得物理学博士学位,随后进入香港大学物理系从事博士后研究。2023年起在香港大学量子研究院任副研究员。马博文博士主要从事磁性材料中磁子输运及量子磁性的理论研究,关注磁性自由度与电子、晶格、光以及拓扑效应的相互作用,及其在自旋电子学中的应用。在Nat. Phys.、Phys. Rev. Lett.和Phys. Rev. B等国际期刊上发表多篇论文,2023年在美国物理学会三月会议作邀请报告。