论文标题
手性声子：循环两极分化的拉曼光谱和$ \ textit {ab intib} $计算
Chiral phonons: circularly polarized Raman spectroscopy and $\textit{ab initio}$ calculations in a chiral crystal tellurium
论文作者
论文摘要
最近，手性的声子（手性声子）引起了极大的关注。手性声子表现出角度和伪角动量。在循环极化的拉曼光谱中，可以在反向散射构型中沿手性晶体的主要轴检测$γ_3$模式的峰值分裂。另外，当入射的伪角矩和散射的圆形极光光相反时，就会发生峰值分裂。到目前为止，已经观察到二元晶体中的手性声子，而尚未观察到一级晶体中的晶体。在这里，我们观察到手性的一级晶体中的手性声子。声子的伪角动量是通过$ \ textit {ab initio} $计算在TE中获得的。通过此计算，我们验证了拉曼散射中伪角动量的保护定律。根据这种保护定律，我们确定了手性晶体的惯用性。我们还使用类似于电动环形单极的对称性的度量来评估了声子的真实手性。
Recently, phonons with chirality (chiral phonons) have attracted significant attention. Chiral phonons exhibit angular and pseudo-angular momenta. In circularly polarized Raman spectroscopy, the peak split of the $Γ_3$ mode is detectable along the principal axis of the chiral crystal in the backscattering configuration. In addition, peak splitting occurs when the pseudo-angular momenta of the incident and scattered circularly polarized light are reversed. Until now, chiral phonons in binary crystals have been observed, whereas those in unary crystals have not been observed. Here, we observe chiral phonons in a chiral unary crystal Te. The pseudo-angular momentum of the phonon is obtained in Te by an $\textit{ab initio}$ calculation. From this calculation, we verified the conservation law of pseudo-angular momentum in Raman scattering. From this conservation law, we determined the handedness of the chiral crystals. We also evaluated the true chirality of the phonons using a measure with symmetry similar to that of an electric toroidal monopole.
