arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2201.04950cond-mat.mtrl-sciphysics.app-ph
收藏

全矢量弹性波的拓扑材料

Topological materials for full-vector elastic waves

Ying Wu, Jiuyang Lu, Xueqin Huang, Yating Yang, Li Luo, Linyun Yang, Feng Li, Weiyin Deng, Zhengyou Liu

摘要:

弹性波操纵在各种尺度的应用中具有重要意义,包括微小弹性器件的信息处理和大型固体结构的噪声控制。最近出现的拓扑材料开辟了一条新的途径,在固体中调制弹性波。然而,由于弹性波的全矢量特征以及纵向分量和横向分量的复杂耦合,与操纵声波(标量波)和电磁波(矢量波但仅横向)相比,操纵弹性波通常是困难的。到目前为止,拓扑材料,包括绝缘体和半金属,已经实现了声波和电磁波。虽然弹性波的拓扑材料也有报道,但观察到的拓扑边缘模都位于畴壁上。一个自然的问题可以问:是否存在一个弹性超材料的拓扑边缘模式只在自己的边界上?在这里,我们报告了一种3D金属打印的双层超材料,在拓扑上绝缘弹性波。通过引入手征层间耦合,导出了弹性波的自旋轨道耦合,并由此得到了非平凡的拓扑性质。在单拓扑相的边界上显示出具有涡旋特征的螺旋边缘态。我们进一步展示了异质结构的超材料,表现出可调的边缘传输。我们的工作可能在基于固体中弹性波的设备中具有潜力。

英文摘要:

Elastic wave manipulation is important in a wide variety of scales in applications including information processing in tiny elastic devices and noise control in big solid structures. The recent emergence of topological materials opens a new avenue toward modulating elastic waves in solids. However, because of the full-vector feature, and the complicated couplings of the longitudinal and transverse components of elastic waves, manipulating elastic waves is generally difficult, compared with manipulating acoustic waves (scalar waves) and electromagnetic waves (vectorial waves but transverse only). Up to date, topological materials, including insulators and semimetals, have been realized for acoustic and electromagnetic waves. Although topological materials of elastic waves have also been reported, the topological edge modes observed all lie on the domain wall. A natural question can be asked: whether there exists an elastic metamaterial with the topological edge modes on its own boundary only? Here, we report a 3D metal-printed bilayer metamaterial, insulating topologically the elastic waves. By introducing the chiral interlayer couplings, the spin-orbit couplings for elastic waves are induced, which give rise to nontrivial topological properties. The helical edge states with the vortex feature are demonstrated on the boundary of the single topological phase. We further show a heterostructure of the metamaterial, which exhibits tunable edge transport. Our work may have potential in devices based on elastic waves in solids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑