论文标题
密度驱动的高阶拓扑相变的无定形固体
Density-driven higher-order topological phase transitions in amorphous solids
论文作者
论文摘要
与微观结构的特定空间分布无关的无定形拓扑状态已引起了很多关注。最近，在无定形系统中提出了高阶拓扑绝缘子，它们是物质的新拓扑阶段。在这里，我们提出了密度驱动的高阶拓扑相变，该相位在二维无定形系统中。我们证明，无定形系统在低密度下构成了拓扑琐事。随着晶格位点的密度的增加，拓扑相位相位转换为以量化四极力矩和拓扑角态的存在为特征的高阶拓扑相。此外，我们确认密度驱动的高阶拓扑相变是尺寸的。此外，我们的结果应一般性，并且同样适用于三维无定形系统。我们的发现可能会大大丰富对无定形系统中高阶拓扑状态的研究。
Amorphous topological states, which are independent of the specific spatial distribution of microscopic constructions, have gained much attention. Recently, higher-order topological insulators, which are a new class of topological phases of matter, have been proposed in amorphous systems. Here, we propose a density-driven higher-order topological phase transition in a two-dimensional amorphous system. We demonstrate that the amorphous system hosts a topological trivial phase at low density. With an increase in the density of lattice sites, the topological trivial phase converts to a higher-order topological phase characterized by a quantized quadrupole moment and the existence of topological corner states. Furthermore, we confirm that the density-driven higher-order topological phase transition is size dependent. In addition, our results should be general and equally applicable to three-dimensional amorphous systems. Our findings may greatly enrich the study of higher-order topological states in amorphous systems.
