论文标题
检测与拉曼散射的非手续晶体中的声子螺旋性
Detection of phonon helicity in nonchiral crystals with Raman scattering
论文作者
论文摘要
最近，已经预测，电子的浆果曲率可以为声子产生角动量。在具有时间反转对称性的系统中，声子动量的方向锁定在声子波矢量上。 Accordingly, this phenomenon has received the name of ``phonon helicity". Here, we present a theory to unveil the signatures of such phonon helicity using Raman scattering. We show that the intensity of Raman scattering for circularly polarized light in BaMnSb$_2$ (a prototypical nonchiral Dirac insulator) changes under a reversal of the phonon wave vector, and that the phonon helicity can可以从这种变化中推断出我们的结果与手性晶体中基于拉曼的角度动量的发现。
Recently, it has been predicted that the Berry curvature of electrons can produce an angular momentum for phonons. In systems with time-reversal symmetry, the direction of the phonon angular momentum is locked to the phonon wave vector. Accordingly, this phenomenon has received the name of ``phonon helicity". Here, we present a theory to unveil the signatures of such phonon helicity using Raman scattering. We show that the intensity of Raman scattering for circularly polarized light in BaMnSb$_2$ (a prototypical nonchiral Dirac insulator) changes under a reversal of the phonon wave vector, and that the phonon helicity can be inferred from that change. We compare our results to recent reports of Raman-based detection of phonon angular momentum in chiral crystals.
