论文标题
Floquet高阶拓扑绝缘子在定期驱动的两部分晶格中
Floquet higher order topological insulator in a periodically driven bipartite lattice
论文作者
论文摘要
Floquet高阶拓扑绝缘子（FHOTIS）是一个新的拓扑阶段，可以在定期驱动的晶格中发生。尚未确定一个适当的实验平台来实现Fhotis。我们引入了一个定期驱动的两分（两波段）系统，该系统托有FHOTI阶段，并预测该晶格可以在实验性现实的光学波导阵列中实现，类似于先前用于研究异常的浮球绝缘体的晶体。该模型通过调整耦合强度参数而不会破坏晶格对称性，从而表现出从一阶到二阶拓扑物质的有趣相变。在FHOTI阶段，晶格以欧吉属$ 0 $或$π$主持角模式，这在单个耦合中对疾病非常有力。
Floquet higher order topological insulators (FHOTIs) are a novel topological phase that can occur in periodically driven lattices. An appropriate experimental platform to realize FHOTIs has not yet been identified. We introduce a periodically-driven bipartite (two-band) system that hosts FHOTI phases, and predict that this lattice can be realized in experimentally-realistic optical waveguide arrays, similar to those previously used to study anomalous Floquet insulators. The model exhibits interesting phase transitions from first-order to second-order topological matter by tuning a coupling strength parameter, without breaking lattice symmetry. In the FHOTI phase, the lattice hosts corner modes at eigenphase $0$ or $π$, which are robust against disorder in the individual couplings.
