Synthetic band-structure engineering in polariton crystals with non-Hermitian topological phases
Synthetic band-structure engineering in polariton crystals with non-Hermitian topological phases
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DOI：
10.1038/s41467-020-18213-1
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发表时间：
2020-09-04
影响因子：
16.6
通讯作者：
Lagoudakis, P. G.
中科院分区：
文献类型：
--
作者：
Pickup, L.;Sigurdsson, H.;Lagoudakis, P. G.
合成晶格为在干净和受控的实验环境中模拟和探索固态材料的能带结构提供了理想的环境。到目前为止，物理实现主要集中在实现系统的不可逆图案化或干涉技术，如冷原子的光学晶格。在这里，我们实现了可重新编程的合成带结构工程在全光激子极化激元晶格。我们证明极化激元凝聚成激发态的线性一维晶格，周期环，二聚非平凡的拓扑相位，和缺陷模式利用可塑性光学印记非厄米特电位景观。凝聚晶格的稳定激发性质与强相互作用的网站之间的结果在一个积极可调的非厄米模拟的苏-施里弗-Heeger系统。为了模拟固态材料的能带结构，通常通过光学晶格或通过不可逆图案化系统来生成合成晶格。在这里，作者提出了可重构的光学激子极化激元晶格中的合成带结构，并产生非厄米拓扑相位。
Synthetic crystal lattices provide ideal environments for simulating and exploring the band structure of solid-state materials in clean and controlled experimental settings. Physical realisations have, so far, dominantly focused on implementing irreversible patterning of the system, or interference techniques such as optical lattices of cold atoms. Here, we realise reprogrammable synthetic band-structure engineering in an all optical exciton-polariton lattice. We demonstrate polariton condensation into excited states of linear one-dimensional lattices, periodic rings, dimerised non-trivial topological phases, and defect modes utilising malleable optically imprinted non-Hermitian potential landscapes. The stable excited nature of the condensate lattice with strong interactions between sites results in an actively tuneable non-Hermitian analogue of the Su-Schrieffer-Heeger system. To simulate band structures of solid state materials synthetic lattices are usually generated by optical lattices or by irreversible patterning the system. Here, the authors present reconfigurable synthetic band-structures in optical exciton-polariton lattices and generate non-Hermitian topological phases.