Momentum-Dependent Spin Splitting by Collinear Antiferromagnetic Ordering

作者：Satoru Hayami, Yuki Yanagi, Hiroaki Kusunose · 发表于：Journal of the Physical Society of Japan · 年份：2019 · DOI：10.7566/jpsj.88.123702 · 被引用次数：504 · 研究领域：Advanced Condensed Matter Physics、Topological Materials and Phenomena、Multiferroics and related materials

We clarify the macroscopic symmetry and microscopic model-parameter conditions for emergence of spin-split electronic band structure in collinear antiferromagnets without atomic spin-orbit coupling. By using the microscopic multipole descriptions, we elucidate the fundamental degree of freedom in a cluster unit of an antiferromagnet giving rise to an effective spin-orbit interaction through the anisotropic kinetic motions of electrons. We show a correspondence of the ordering patterns and resultant momentum-dependent spin splitting for 32 crystallographic point groups after demonstrating two intuitive examples of four-sublattice pyrochlore and tetragonal systems. Our study unveils potential features of collinear antiferromagnets with considerably weak spin-orbit coupling in light-element materials and 3$d$ transition metal oxides, which can be utilized for a spin-current generation by electric (thermal) current and a magneto-striction effect.