论文标题
连贯的原子气中电磁诱导的莫伊尔光学晶格
Electromagnetically induced moiré optical lattices in a coherent atomic gas
论文作者
论文摘要
通过原子集合中的原子相干性，电磁诱导的光学（或光子）晶格最近获得了理论上和实验兴趣。我们在这里构想了一种产生电磁诱导的Moiré光学晶格的方法 - 当两个相同的周期性模式（晶格）以扭曲的角度（$θ$）重叠时 - 在三级相干性原子气体下在电磁诱导的透明度下工作。我们表明，改变了两个本构的sublattices之间的扭曲角度和相对强度，始终会出现极度平坦的MoiréBloch带，类似于在其他情况下发现的典型平坦频段和Moiré物理学。还揭示了诱导的周期结构中光传播的动力学，证明了独特的线性定位和离域特性。我们的方案可以在Rubidium Atomic介质中实施，在该介质中，预测的Moiré光学晶格和扁平带自然可以观察到。
Electromagnetically induced optical (or photonic) lattices via atomic coherence in atomic ensembles have recently received great theoretical and experimental interest. We here conceive a way to generate electromagnetically induced moiré optical lattices -- a twisted periodic pattern when two identical periodic patterns (lattices) are overlapped in a twisted angle ($θ$) -- in a three-level coherent atomic gas working under electromagnetically induced transparency. We show that, changing the twisted angle and relative strength between the two constitutive sublattices, the moiré Bloch bands that are extremely flattened can always appear, resembling the typical flat-band and moiré physics found in other contexts. Dynamics of light propagation in the induced periodic structures demonstrating the unique linear localization and delocalization properties are also revealed. Our scheme can be implemented in a Rubidium atomic medium, where the predicted moiré optical lattices and flattened bands are naturally observable.
