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Seminar: 磁性相互作用理论研究






In the talk I will report on a series of our work in magnetic exchange interaction:We introduce an efficient method of computing magnetic exchange interactions in systems with strong correlations. It is based on a magnetic force theorem that evaluates linear response due to rotations of magnetic moments and uses a generalized spectral density functional framework allowing us to explore several approximations ranging from local density functional to exact diagonalization based dynamical mean field theory. This technique has been successfully used fora variety of materials. Considering the spin orbit coupling (SOC) as perturbation, we extract the general expression of a bilinear spin Hamiltonian, including isotropic exchange interaction, antisymmetric Dzyaloshinskii-Moriya (DM) interaction and symmetric Г term. Though it is commonly believed that the magnitude of the DM and Г interaction correspond to the first and second order of SOC strength λ respectively, we clarify that the term proportional to λ2 also has contribution to DM interaction. I will present the numerical method to calculate it. I will also introduce our several other works in this field.


万贤纲,在南京大学获本、硕、博;2000年开始在南京大学任教,目前为教授。获得2014年度香港大学Daniel Tsui Fellowship。2015年获得国家杰出青年科学基金;2016年被评为教育部长江学者特聘教授。获中国物理学会2018-2019年度叶企孙物理奖。2019年获首届腾讯基金会“科学探索奖”。获2019年南京大学突出贡献奖。2020年获第二届全国创新争先奖。