论文标题
抗铁磁共振共振的Terahertz涡流梁的总角动量二分法
Total angular momentum dichroism of the terahertz vortex beams at the antiferromagnetic resonances
论文作者
论文摘要
Terahertz涡流横梁具有不同的轨道角动量$ $ l = {\ pm} 1 $，$ {\ pm} 2 $，$ {\ pm} 3 $，以及$ {\ pm} 4 $ and spin Angular Momentum $之一，用于研究AntiferomAgagnoctic（fm） tbfe $ _3 $（bo $ _3 $）$ _ 4 $和ni $ _3 $ teo $ _6 $单晶。在这两种材料中，我们都观察到在外部磁场中分裂的AFM共振的强涡束二分法。涡旋二色性的大小与由于$σ$而导致的常规圆形二科主义相当。 AFM共振的选择规则受涡流梁的总角动量的控制：$ j =σ+l $。特别是，对于$ l = {\ pm} 2 $，$ {\ pm} 3 $，和$ {\ pm} 4 $ $ l $的符号显示在传统的循环极化$σ$上占主导地位。
Terahertz vortex beams with different superposition of the orbital angular momentum $l={\pm}1$, ${\pm}2$, ${\pm}3$, and ${\pm}4$ and spin angular momentum $σ={\pm}1$ were used to study antiferromagnetic (AFM) resonances in TbFe$_3$(BO$_3$)$_4$ and Ni$_3$TeO$_6$ single crystals. In both materials we observed a strong vortex beam dichroism for the AFM resonances that are split in external magnetic field. The magnitude of the vortex dichroism is comparable to that for conventional circular dichroism due to $σ$. The selection rules at the AFM resonances are governed by the total angular momentum of the vortex beam: $j=σ+l$. In particular, for $l={\pm}2$, ${\pm}3$, and ${\pm}4$ the sign of $l$ is shown to dominate over that for conventional circular polarization $σ$.
