Mandal S, Banerjee R, Ostrovskaya Elena A, Liew T C H
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Nonlinear Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia.
Phys Rev Lett. 2020 Sep 18;125(12):123902. doi: 10.1103/PhysRevLett.125.123902.
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.
我们考虑了受非相干激发的耦合椭圆微柱锯齿形链中的激子极化激元。系统的驱动耗散性质以及微柱内部自然存在的极化分裂会产生非互易动力学，最终导致非厄米趋肤效应，即系统的所有模式都坍缩到一条边缘。结果，极化激元仅沿链的一个方向传播，与激发位置无关，而相反方向的传播受到抑制。该系统对无序具有鲁棒性，并且利用极化激元的双稳性质来编码信息，我们展示了单向信息传输。这为紧凑且鲁棒的无反馈一维极化激元传输通道铺平了道路，无需外部磁场，与极化激元电路的提议兼容。
