Nonreciprocal Transport of Exciton Polaritons in a Non-Hermitian Chain
Nonreciprocal Transport of Exciton Polaritons in a Non-Hermitian Chain
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DOI：
10.1103/physrevlett.125.123902
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发表时间：
2020-09-17
影响因子：
8.6
通讯作者：
Liew, T. C. H.
中科院分区：
文献类型：
--
作者：
Mandal, S.;Banerjee, R.;Liew, T. C. H.
我们考虑非相干激发下之字形耦合椭圆微柱链中的激子极化激元。系统的驱动耗散性质沿着柱内自然存在的偏振分裂产生非互易动力学，这最终导致非厄米集肤效应，其中系统的所有模式坍缩到一个边缘。其结果是，极化激元仅在沿着链的沿着一个方向上传播，而与激发位置无关，并且在相反方向上的传播被抑制。该系统表现出对无序的鲁棒性，并利用极化激元的非线性来编码信息，我们显示了单向信息传输。这为紧凑和鲁棒的无反馈一维极化激元传输通道铺平了道路，而不需要外部磁场，这与极化激元电路的建议兼容。
We consider exciton polaritons in a zigzag chain of coupled elliptical micropillars subjected to incoherent excitation. The driven-dissipative nature of the system along with the naturally present polarization splitting inside the pillars gives rise to nonreciprocal dynamics, which eventually leads to the non-Hermitian skin effect, where all the modes of the system collapse to one edge. As a result, the polaritons propagate only in one direction along the chain, independent of the excitation position, and the propagation in the opposite direction is suppressed. The system shows robustness against disorder and, using the bistable nature of polaritons to encode information, we show one-way information transfer. This paves the way for compact and robust feedback-free one-dimensional polariton transmission channels without the need for external magnetic field, which are compatible with proposals for polaritonic circuits.