论文标题
在拓扑山谷语音晶体中弹性谷自旋控制的手性耦合
Elastic Valley Spin Controlled Chiral Coupling in Topological Valley Phononic Crystals
论文作者
论文摘要
与声音谷伪旋转不同的是，弹性波的真实物理自旋增加了一种新型的工具，能够从局部观点设想拓扑山谷语音晶体的山谷旋转物理学。在这里，我们报告了局部弹性山谷自旋的观察以及以前忽略的隐藏弹性自旋 - 瓦利锁定机制。我们证明，沿拓扑界面的山谷声子状态的选择性单向路由可以通过在不同界面的不同界面位置施加弹性旋转元源，而谷数旋转对应关系可以逆转。我们通过分析理论和在不同界面位置的不同界面位置的相反局部弹性旋转密度对不同传输方向的相反局部弹性自旋密度的测量，我们将选择性方向性的物理机理作为山谷声子状态的弹性旋转手性偶联。山谷拓扑边缘声子的弹性旋转可以扩展到其他拓扑状态，并提供了探索拓扑超材料的新工具。
Distinct from the phononic valley pseudo-spin, the real physical spin of elastic waves adds a novel tool-kit capable of envisaging the valley-spin physics of topological valley phononic crystals from a local viewpoint. Here, we report the observation of local elastic valley spin as well as the hidden elastic spin-valley locking mechanism overlooked before. We demonstrate that the selective one-way routing of valley phonon states along the topological interface can be reversed by imposing the elastic spin meta-source at different interface locations with opposite valley-spin correspondence. We unveil the physical mechanism of selective directionality as the elastic spin controlled chiral coupling of valley phonon states, through both analytical theory and experimental measurement of the opposite local elastic spin density at different interface locations for different transport directions. The elastic spin of valley topological edge phonons can be extended to other topological states and offers new tool to explore topological metamaterials.
