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.

中文翻译：

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非厄密链中激子极化子的不可逆传输

我们考虑耦合椭圆形微柱的锯齿形链中的激子极化子。系统的驱动耗散特性以及自然存在于支柱内部的极化分裂会引起不可逆的动力学，最终导致非埃尔米特集肤效应，其中系统的所有模式都崩溃到一个边缘。结果，极化子仅沿着链的一个方向传播，与激发位置无关，并且抑制了相反方向的传播。该系统显示了抵抗疾病的鲁棒性，并且利用极化子的双稳态特性对信息进行编码，我们展示了单向信息传递。