论文标题

非热拓扑激子 - 波利顿角模式

Non-Hermitian topological exciton-polariton corner modes

论文作者

Xu, Xingran, Bao, Ruiqi, Liew, Timothy C. H.

论文摘要

我们从理论上研究了二维激子 - 果龙晶格,并预测可以在非谐波泵送下形成非霍米特拓扑角模式。作为非富甲皮肤效应的概括,所有特征状态都位于我们模型中的两个角落。与激子 - 帕利顿系统中的其他提案相比,这也是一个更高的维拓扑,我们发现它允许大部分系统中的传播信号围绕缺陷传播,这是在具有Hermitian边缘状态的一维拓扑晶格或二维Lattices中不可能的。此外,由于所有极化状态都远离激发点,因此该系统为更准确的测量北极星 - 帕利顿相互作用强度提供了机会,因为泵诱导的激发激子 - 库库在空间上与所有极化状态分开。

We theoretically study two-dimensional exciton-polariton lattices and predict that non-Hermitian topological corner modes can be formed under non-resonant pumping. As a generalization of the non-Hermitian skin effect, all eigenstates are localized at the two corners in our model. This is also a higher dimensional topology compared to other proposals in exciton-polariton systems and we find that it allows propagating signals in the bulk of the system to travel around defects, which is not possible in one-dimensional topological lattices or two-dimensional lattices with Hermitian edge states. Furthermore, as all polariton states are localized away from an excitation spot, the system offers an opportunity for more accurate measurement of the polariton-polariton interaction strength as the pump-induced exciton-reservoir is spatially separated from all polariton states.

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