郭硕鸿讲座（第四十九期）（2023年11月14日15:40）：非共线反铁磁材料中反常霍尔效应的第一原理计算

主持人：董建文 教授

报告简介：The anomalous Hall effect is generally treated as a direct response to the injecting charge current with spin-orbit interaction in magnetic materials. Recently, many works on the anomalous Hall effect in non-collinear anti-ferromagnetic materials are reported from both theoretical and experimental groups. And the physical origin of this anomalous Hall effect is mainly attributed to the Berry curvature.

In this work, using a first-principles-based scattering wave function approach, we study the anomalous Hall effect in non-collinear anti-ferromagnetic L12-type Mn3Ir and find that the corresponding anomalous Hall conductivity can be as large as 3.4×10^4 [Ω∙cm]^(-1) at low temperature, which is two orders of magnitude larger than that from Berry curvature calculations, indicating that the Berry curvature may not enough for this novel anomalous Hall effect.

With a detailed analysis of the anomalous Hall effect therein, we found that the scattering process dominates. We propose that the anomalous Hall current is coming from the combination of the Ir induced conventional/inverse spin Hall effect and the spin reorientation when the corresponding spin current passes through the local magnetic moments of Mn in L12-type Mn3Ir. This indirect anomalous Hall effect should be universal in non-collinear anti-ferromagnetic materials and needed further study in the future.

报告人简介：夏钶，男，1997年南京大学物理系理学博士，1998–2002荷兰、美国等地大学物理系计算材料科学博士后。2002年入选中国科学院百人计划，2008国家杰出青年科学基金获得者。历任物理研究所副研究员、研究员，博士生导师。2009-2020年北京师范大学物理系教授，系主任，2020年-2022年北京计算科学研究研究中心教授，2022年调入东南大学物理学院任首席教授。