报告时间：2023年4月7日 10:00-12:00
腾讯会议：427-910-266
摘要：In recent years, the study of magnetic interactions in two-dimensional (2D) materials has gained significant interest due to their potential applications in spintronics and quantum computing. Two important types of magnetic interactions in 2D materials are the Kitaev interaction and interactions that can lead to magnetic anisotropies. The Kitaev interaction is a bond-dependent interaction defined on a honeycomb lattice and can potentially leads to Kitaev quantum spin liquid. The magnetic anisotropies break the spin rotational symmetry and can thus bypass the Mermin-Wagner theorem to realize long range magnetic orders in 2D materials, which are crucial in 2D magnets. Both Kitaev and the existence of magnetic anisotropies require spin-orbit coupling effects. In this talk, I will discuss our recent work on the microscopic origins of exchange interactions using strong-coupling perturbation theory. In the first part of my talk I will discuss the whether or not and how a Kitaev interaction exist in honeycomb cobaltates BaCo2(AsO4)2. In the second part, I will discuss in detail how the magnetic anisotropies in CrX3 system arise from microscopic point of view.
简介：刘晓宇博士于2014年在清华大学获理学学士学位，2020年在清华大学高等研究院获理学博士学位。此后他在加拿大多伦多大学（2020-2022）、美国华盛顿大学（2022至今）从事博士后研究工作。她的研究领域是理论与计算凝聚态物理，近期主要关注磁性材料交换相互作用的微观机制。
