论文标题

非雷神激子 - 波利顿环晶格

Non-reciprocal Exciton-Polariton Ring Lattices

论文作者

Xu, Huawen, Dini, Kevin, Xu, Xingran, Banerjee, Rimi, Mandal, Subhaskar, Liew, Timothy C. H.

论文摘要

最近的实验表明,尽管早些时候认为在Polariton冷凝过程中应该丢失这种激光器的相位信息,但轨道角动量(OAM)从非共振激光转移到了激子 - 波利顿冷凝物上。我们研究了一种现象学理论,即通常的角动量独立增益和保持角动量保留增益的相互作用。我们发现,即使后者小得多,也足以倾向于凝结成给定的轨道角动量状态。这进一步允许在系统中破坏对称性,这进一步在耦合环的晶格中进一步体现了非转录单向传播。即使我们仅考虑环之间的Hermitian互惠耦合,但局部非热度也会产生有效的非重新循环耦合,并支持与非亚米特型皮肤效应相关的非热拓扑不变(绕组数)。

Recent experiments have shown the transfer of orbital angular momentum (OAM) from a non-resonant laser onto an exciton-polariton condensate, despite earlier views that the phase information of such a laser should be lost during the process of polariton condensation. We study with a phenomenological theory the interplay of a usual angular momentum independent gain and an angular momentum preserving gain. We find that even when the latter is much smaller, it is enough to favour condensation into a given orbital angular momentum state. This further allows a breaking of symmetry in the system, which further manifests in non-reciprocal one-way propagation in a lattice of coupled rings. Even though we consider only Hermitian reciprocal coupling between rings, the local non-Hermiticity generates an effective non-reciprocal coupling and supports a non-Hermitian topological invariant (winding number) associated to a non-Hermitian skin effect.

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