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Orbital corner states on breathing kagome lattices
Physical Review B ( IF 3.2 ) Pub Date : 2020-05-26 , DOI: 10.1103/physrevb.101.195143
Xiancong Lu , Ying Chen , Huanyang Chen

We investigate the higher-order topological insulators on the breathing kagome lattices with p-orbital freedom. The bulk topological phase diagram is obtained by calculating the Z3 Berry phase of the p-band model. The existence of a different class of orbital corner states is demonstrated on the (zero-dimensional) finite-size triangular structure. We find that the transverse hopping of the p orbital is essential for the corner states to appear on the finite-size structure. The orbital configurations of the corner states are also explored and rich orbital orders are identified. Moreover, we show that the orbital corner states can be realized in a realistic photonic system, which are in good agreement with the predictions of the tight-binding model and then offer a versatile platform for the orbital physics.

中文翻译:

呼吸的kagome晶格上的轨道角状态

我们研究了呼吸Kagome格上的高阶拓扑绝缘子 p轨道自由。体拓扑相图是通过计算ž3 浆果阶段 p带模型。在(零维)有限尺寸的三角形结构上,证明了存在另一类轨道角状态。我们发现,p轨道对于拐角状态出现在有限大小的结构上至关重要。还研究了转角状态的轨道配置,并确定了丰富的轨道顺序。此外,我们证明了可以在现实的光子系统中实现轨道角状态,这与紧束缚模型的预测非常吻合,然后为轨道物理学提供了一个通用平台。
更新日期:2020-05-26
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