反铁磁共振太赫兹涡旋光束的总angular momentum二向色性
Total angular momentum dichroism of the terahertz vortex beams at the antiferromagnetic resonances
摘要：
利用轨道角动量$l={\pm}1$、${\pm}2$、${\pm}3$和${\pm}4$与自旋角动量$σ={\pm}1$不同叠加的太赫兹涡旋光束，研究了TbFe $_3$（BO $_3$）$_4$和Ni $_3$ TeO $_6$单晶的反铁磁（AFM）共振.在这两种材料中，我们观察到一个强大的涡旋光束二向色性的原子力显微镜共振分裂在外部磁场。涡旋二色性的大小与由于$σ$的常规圆二色性的大小相当。原子力显微镜共振的选择规则由涡旋光束的总角动量决定：$j=σ+l$。特别地，对于$l={\pm}2$、${\pm}3$和${\pm}4$，$l$的符号被示出为优于常规圆偏振$σ$的符号。
英文摘要：
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 $σ$.
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