论文标题
在非炎症激子 - 波利顿系统中的波数据包动力学
Wave packet dynamics in a non-Hermitian exciton-polariton system
论文作者
论文摘要
从理论上讲，我们在通用的非弱点，光学各向异性激发激素 - 果龙系统中研究了波数据包的动力学，该系统在动量空间中以异常点的形式表现出其复杂值的特征力的脱整体。我们观察到由其特征力支配的波包的自我加速和重塑。我们进一步发现，激子 - 波利顿波包倾向于以较小的衰减速率自组织到本征态，然后朝着动量空间中衰减速率的最小值传播，从而导致真实空间中的方向传输。我们还描述了假想费米弧上的伪替素拓扑缺陷的形成，其中两个特征属的衰减速率在动量空间中重合。可以通过光学各向异性腔间隔物或激子托管材料在微腔中观察到非热性对激子极性子动力学的影响。
We theoretically investigate the dynamics of wave packets in a generic, non-Hermitian, optically anisotropic exciton-polariton system that exhibits degeneracies of its complex-valued eigenenergies in the form of pairs of exceptional points in momentum space. We observe the self-acceleration and reshaping of the wave packets governed by their eigenenergies. We further find that the exciton-polariton wave packets tend to self-organize into the eigenstate with the smaller decay rate, then propagate towards the minima of the decay rates in momentum space, resulting in directional transport in real space. We also describe the formation of pseudospin topological defects on the imaginary Fermi arc, where the decay rates of the two eigenstate coincide in momentum space. These effects of non-Hermiticity on the dynamics of exciton polaritons can be observed experimentally in a microcavity with optically anisotropic cavity spacer or exciton-hosting materials.
