标题： 极性LiNbO3中的手性声子 显示英文标题

标题： Chiral phonons in polar LiNbO3

摘要： 准粒子描述了多体系统中的集体激发，它们的对称性分类具有根本的重要性，因为它们支配着各种时间尺度上的物理过程，例如激发态、输运现象和相变。 近期研究表明，准粒子可以具有手性，并且这一自由度导致了多种重要的现象。 其中，由于手性声子固有的磁性，这种磁性非平凡地连接了自旋系统和晶格，因此吸引了极大的兴趣。 在这里，我们直接证明了典型极性晶体LiNbO3中存在手性声子。 我们的演示为展示承载手性声子的材料增加了极性晶体，并且由于其预期的原位可切换的声子手性和相关的声子角动量控制，创造了手性声子学领域的巨大潜力。 显示英文摘要

摘要： Quasiparticles describe collective excitations in many-body systems, and their symmetry classification is of fundamental importance because they govern physical processes on various timescales, e.g., excited states, transport phenomena, and phase transitions. Recent studies have revealed that quasiparticles can possess chirality and that this degree of freedom leads to various important phenomena. Among them, chiral phonons have recently attracted significant interest because of their intrinsic magnetism, which non-trivially bridges the spin system and the lattice. Here, we directly prove the presence of chiral phonons in a prototypical polar crystal LiNbO3. Our demonstration adds a polar crystal in the showcase of materials hosting chiral phonons and, furthermore, creates a substantial potential in chiral phononics because of its expected in-situ switchable phonon chirality and associated control of phonon angular momentum.