标题： 真实手性声子的非线性光学响应：光致声子角动量、帕尔帖效应和轨道电流 显示英文标题

标题： Nonlinear optical response of truly chiral phonons: Light-induced phonon angular momentum, Peltier effect, and orbital current

摘要： 非线性光学响应理论用于研究手性声子对太赫兹和红外光的非线性光学响应。 我们表明，光致角动量随着手性声子弛豫时间$\tau$的平方增加，与普通声子相比，角动量显著更大。 我们还发现，由手性声子引起的光致珀尔帖效应是通过一种不同于最近提出的机制发生的；感应的能量电流按$\propto\tau^2$规律变化，在清洁极限下产生更大的能量电流。 我们证明了产生的角动量与能量电流之间存在线性关系。 最后，我们表明，轨道电流作为一种类似于自旋电流的现象，是通过非线性响应产生的。 这些发现展示了手性声子的独特特性和功能。 显示英文摘要

摘要： The nonlinear optical responses of chiral phonons to terahertz and infrared light are studied using the nonlinear response theory. We show that the photo-induced angular momentum increases with the square of the chiral-phonon relaxation time $\tau$, giving a significantly larger angular momentum compared to ordinary phonons. We also find that the photo-induced Peltier effect by chiral phonons occurs through a mechanism distinct from those proposed recently; the induced energy current scales $\propto\tau^2$, giving a larger energy current in the clean limit. We prove a linear relation between the generated angular momentum and the energy current. Lastly, we show that the orbital current, an analog of the spin current, occurs through a nonlinear response. These findings demonstrate the unique properties and functionalities of chiral phonons.