Harnessing the Power of Moiré Superlattices in Photonics and Optoelectronics
Researchers from the Institute of Physics of the Chinese Academy of Sciences have published an overview of recent progress in emerging moiré photonics and optoelectronics. Moiré superlattices are artificial quantum materials formed by stacking two or more 2D layered materials with a slight lattice mismatch and/or a small rotational twist. They introduce a potential landscape of much larger length scale than the crystal periodicity of the constituent 2D layers, providing a novel paradigm for engineering band structures and hence a plethora of exotic quantum phenomena. Moiré superlattices offer a powerful strategy for engineering excitonic quasiparticles in both real and momentum spaces, giving rise to quantum-dot-like moiré excitons and Bragg-umklapp moiré excitons, respectively.