声子角动量的进动模式

中文摘要 AI 辅助

磁振子是电子自旋的集体进动激发，在新兴信息技术中普遍存在。在此，我们表明晶格可以支持声子角动量的类似进动模式。圆偏振声子与垂直于圆周运动平面的线偏振声子的叠加，产生一个横向角动量分量，该分量以它们的差频旋转，并在由参与声子线宽决定的时间尺度上衰减，从而定义了一个具有自身共振和寿命的模式。自旋与声子角动量之间的耦合使这种进动模式在共振附近与磁振子杂化。我们的结果确立了声子角动量进动模式作为磁振子的晶格类似物，并识别了它们的光谱和时域特征。

英文摘要

Magnons are collective precessional excitations of electron spins and are ubiquitous in emerging information technologies. Here, we show that the crystal lattice can support an analogous precessional mode of phonon angular momentum. Superposition of a circularly polarized phonon and a linearly polarized phonon normal to the circular-motion plane generates a transverse angular-momentum component that rotates at their difference frequency and decays on a timescale set by the participating phonon linewidths, defining a mode with its own resonance and lifetime. Coupling between spin and phonon angular momentum hybridizes this precessional mode with a magnon near resonance. Our results establish phonon angular momentum precessional modes as lattice analogues of magnons and identify their spectroscopic and time-domain signatures.

发表机构

• Eindhoven University of Technology（埃因霍温理工大学）
• University of Fribourg（弗里堡大学）
• Paul Scherrer Institut（保罗谢勒研究所）

机构由 AI 辅助整理，请以论文原文为准。