论文标题
基于磁环四极杆的旋转电导率隐藏在抗铁磁铁中
Spin Conductivity Based on Magnetic Toroidal Quadrupole Hidden in Antiferromagnets
论文作者
论文摘要
我们通过重点关注磁环四极杆（MTQ）在电子系统中的作用来报告有关抗铁磁铁的自旋电导率的理论结果。 MTQ的特征是电子在电子中的时间逆转秩-2极度张量的自由度，这与常规的Rank-1磁和磁环偶极子不同。基于在共线和非共线性抗磁磁有序下的四方系统的微观$ SD $模型分析，我们澄清，即使没有均匀的磁化强度和旋转轨道耦合，MTQ也成为外部旋转电导率的来源。我们还列出了所有磁性点基以容纳MTQ作为主要阶参数的参数以及候选抗铁磁材料。
We report our theoretical results on spin conductivity in antiferromagnets by focusing on the role of the magnetic toroidal quadrupole (MTQ) in electron systems. The MTQ is characterized as a time-reversal-odd rank-2 polar tensor degree of freedom in electrons, which is distinct from conventional rank-1 magnetic and magnetic toroidal dipoles. Based on a microscopic $sd$ model analysis for a tetragonal system under both collinear and noncollinear antiferromagnetic orderings, we clarify that the MTQ becomes a source of an extrinsic spin conductivity even with neither a uniform magnetization nor spin-orbit coupling. We also list all the magnetic point groups to accommodate the MTQs as a primary order parameter as well as the candidate antiferromagnetic materials.
