论文标题
KTAO中的瞬态手性声子的电子磁矩$ _3 $
Electron magnetic moment of transient chiral phonons in KTaO$_3$
论文作者
论文摘要
高强度THZ激光器允许单个声子模式的连贯激发。通过声子对新兴磁性的超快控制为功能材料打开了新的调谐机制。虽然理论上预测的声子磁矩很小，但最近的实验暗示了各种材料中的显着磁化。为了解释这些现象，我们得出了声子角动量和电子自旋之间的耦合机制。这种耦合引入了旋转和旋转通道的瞬态水平分解以及产生的磁化。我们以perovskite ktao $ _3 $中最低红外活动模式的示例来估算这种磁化。我们的结果表明，根据掺杂水平和电子温度的不同，我们的电子磁矩约为10^{ - 1} $ $ $ $ $ $μ_b$。
High intensity THz lasers allow for the coherent excitation of individual phonon modes. The ultrafast control of emergent magnetism by means of phonons opens up new tuning mechanisms for functional materials. While theoretically predicted phonon magnetic moments are tiny, recent experiments hint towards a significant magnetization in various materials. To explain these phenomena, we derive a coupling mechanism between the phonon angular momentum and the electron spin. This coupling introduces the transient level-splitting of spin-up and spin-down channels and a resulting magnetization. We estimate this magnetization on the example of the lowest infrared active mode in the perovskite KTaO$_3$. Our results show an electronic magnetic moment of $\approx 10^{-1}$ $μ_B$ per unit cell, depending on the doping level and electron temperature.
