论文标题
Altermagnetic Ruo2中的手性镁
Chiral magnons in altermagnetic RuO2
论文作者
论文摘要
铁磁体中的镁具有一种手性，通常在GHz范围内，并且在零波形附近具有二次分散。相比之下，抗铁磁体中的镁质通常被认为具有带有两种手势的条带，它们在整个布里群区域均脱糖，并且在THZ范围内，并且在Brillouin区中心附近具有线性分散。从理论上讲，我们在这里展示了一类新的木元素，上面是典型的$ d $ - 波动altermagnet ruo $ _2 $，并在基态下具有补偿的反平行磁性订单。基于密度功能理论计算，我们观察到RUO $ _2 $中的Thz-范围磁杆带具有交替的手性分裂，类似于电子带的交替自旋分裂，而在零波动附近的线性镁色散。我们还表明，与具有自旋分裂的电子结构相比，由于自旋分裂电子结构，该金属Altermagnet的Landau阻尼被抑制，与具有自旋降级的电子带和chirality-decegenter-devenerate Magnon Bands的人工抗Firomagnetic相相比。
Magnons in ferromagnets have one chirality, and typically are in the GHz range and have a quadratic dispersion near the zero wavevector. In contrast, magnons in antiferromagnets are commonly considered to have bands with both chiralities that are degenerate across the entire Brillouin zone, and to be in the THz range and to have a linear dispersion near the center of the Brillouin zone. Here we theoretically demonstrate a new class of magnons on a prototypical $d$-wave altermagnet RuO$_2$ with the compensated antiparallel magnetic order in the ground state. Based on density-functional-theory calculations we observe that the THz-range magnon bands in RuO$_2$ have an alternating chirality splitting, similar to the alternating spin splitting of the electronic bands, and a linear magnon dispersion near the zero wavevector. We also show that, overall, the Landau damping of this metallic altermagnet is suppressed due to the spin-split electronic structure, as compared to an artificial antiferromagnetic phase of the same RuO$_2$ crystal with spin-degenerate electronic bands and chirality-degenerate magnon bands.
