驱动耗散莫尔激子-极化激元的光学非线性和自发平移对称破缺
Optical non-linearities and spontaneous translational symmetry breaking in driven-dissipative moiré exciton-polaritons
摘要：
由半导体双层形成的莫尔晶格拥有紧密定位的激子，这些激子可以同时与光强烈耦合并具有大的电偶极矩。这有助于实现新形式的极化激元，这些极化激元具有非常强的相互作用，并且已经被预测会导致由多光子共振控制的强光学非线性。在这里，我们调查的激子激子（偶极）相互作用的非本地组件上的光学响应的这些强相互作用的莫尔激子极化激元在强光学驱动的条件下的作用。我们发现，非局域相互作用可以强烈影响的稳态特性，导致多稳定性与破坏的平移对称性和显着的扭曲的多光子共振。我们发展了一种自洽的方法来描述与腔场耦合的莫尔激子的稳态解，在半经典水平上处理激子和光子场之间的长程相互作用。
英文摘要：
Moiré lattices formed from semiconductor bilayers host tightly localised excitons that can simultaneously couple strongly to light and possess large electric dipole moments. This facilitates the realization of new forms of polaritons that are very strongly interacting and that have been predicted to lead to strong optical nonlinearities controlled by multi-photon resonances. Here, we investigate the role of the non-local component of the exciton-exciton (dipolar) interactions on the optical response of these strongly-interacting moiré exciton-polaritons under conditions of strong optical driving. We find that the non-local interactions can strongly influence the steady-state properties leading to multi-stabilities with broken translational symmetry and pronounced distortions of the multi-photon resonances. We develop a self-consistent approach to describe the steady-state solution of moiré excitons coupled to a cavity field, treating the long-range interaction between the excitons and the photon field at the semi-classical level.
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