论文标题
由光控制
Topological phonons in oxide perovskites controlled by light
论文作者
论文摘要
钙钛矿氧化物表现出各种各样的结构阶段，这些阶段具有不同的物理现象，这些现象产生了多种技术应用。 We find that topological phonons, i.e., nodal rings, nodal lines, and Weyl points, are ubiquitous in oxide perovskites in terms of structures (tetragonal, orthorhombic, and rhombohedral), compounds (BaTiO3, PbTiO3, and SrTiO3), and external conditions (photoexcitation, strain, and temperature).特别是，在这些化合物的四方阶段中，当通过光激发稳定时，所有类型的拓扑声子都可以同时出现，而通过热波动稳定的四方相只有一个更有限的拓扑声音子态。此外，我们发现，即使没有相关的结构相变化，也可以使用光激发载体浓度来调整拓扑声子状态并诱导拓扑转换。总体而言，我们建议氧化钙壶作为一个多功能平台，在其中研究拓扑声子及其光线操纵。
Perovskite oxides exhibit a rich variety of structural phases hosting different physical phenomena that generate multiple technological applications. We find that topological phonons, i.e., nodal rings, nodal lines, and Weyl points, are ubiquitous in oxide perovskites in terms of structures (tetragonal, orthorhombic, and rhombohedral), compounds (BaTiO3, PbTiO3, and SrTiO3), and external conditions (photoexcitation, strain, and temperature). In particular, in the tetragonal phase of these compounds, all types of topological phonons can simultaneously emerge when stabilized by photoexcitation, whereas the tetragonal phase stabilized by thermal fluctuations only hosts a more limited set of topological phonon states. Additionally, we find that the photoexcited carrier concentration can be used to tune the topological phonon states and induce topological transitions even without associated structural phase changes. Overall, we propose oxide perovskites as a versatile platform in which to study topological phonons and their manipulation with light.
