AI 中文总结
本研究提出通过相邻铁电体的电极化进动，在普通电介质中高效产生手性选择性声子，为电控手性声子学及自旋电子功能提供了通用途径。
AI 中文摘要
手性声子的发现拓展了晶格振动仅作为被动热载体的传统认知，为声子自旋电子器件开辟了新机遇。然而，其实现大多局限于手性晶体或某些非手性材料动量空间的特定区域。本文提出一种通用机制：通过相邻铁电体中电极化的进动，在普通电介质中产生传播型手性声子。极化动力学通过电致伸缩耦合将其固有角动量传递给晶格，从而泵浦出手性选择性声子，其旋向由极化进动的旋向决定。对于典型的LiNbO₃|Y₃Al₅O₁₂双层结构，我们发现以界面转换电导量化的泵浦效率显著超过手性晶体中热诱导手性声子的产生效率，这得益于铁电体中强的电致伸缩耦合。本研究确立铁电动力学为手性声子的通用电驱动源，为实现电控可编程手性声子学及自旋电子功能提供了通用途径。
英文摘要
The discovery of chiral phonons has expanded the conventional view of lattice vibrations as passive heat carriers, opening new opportunities for phononic spintronic devices. However, their realization has been largely limited to chiral crystals or to specific regions of momentum space in certain achiral materials. Here, we propose a generic mechanism for generating propagating chiral phonons in an ordinary dielectric through the precession of the electric polarization in an adjacent ferroelectric. The polarization dynamics transfers its intrinsic angular momentum to the lattice via electrostrictive coupling, thereby pumping chirality-selective phonons whose handedness is dictated by that of the polarization precession. For a typical LiNbO$_{3}$$|$Y$_{3}$Al$_{5}$O$_{12}$ bilayer, we find that the pumping efficiency quantified by an interfacial convertance substantially exceeds those of thermally induced chiral-phonon generation in chiral crystals, owing to the strong electrostrictive coupling in ferroelectrics. Our work establishes ferroelectric dynamics as a versatile electrical source of chiral phonons and provides a general route toward electrically programmable chiral-phononic and spintronic functionalities.
Comments7 pages, 2 figures
