Moiré Synergy: An Emerging Playground by Coupled Moirés

Abstract

Moiré superlattices of tunable wavelengths and the further developed coupled-moiré systems, by artificially assembling two-dimensional (2D) van der Waals (vdW) materials as designed, have brought up a versatile toolbox to explore fascinating condensed matter physics and their stimulating physicochemical functionalities. In this Perspective, we briefly review the recent progress in the emerging field of moiré synergy, highlighting the synergetic effects arising in distinct multi-moiré heterostructures of graphene and transition metal dichalcogenides (TMDCs). A spectrum of coupled-moiré configurations, the advanced characterization, and the exploitation efforts on the moiré–moiré interactions will be discussed. Finally, we look out for urgent challenges to be conquered in the community and some potential research directions in the near future.

Tuning and exploiting interlayer coupling in two-dimensional van der Waals heterostructures

“…Several studies have investigated the effect of annealing parameters (such as temperature, time, and pressure) on interlayer coupling strength [50,51], which can be precisely characterized by ULF Raman [23]. Meanwhile, CVD method has recently been developed to grow 2D HSs with coherently stacked angles (0 • and 60 • ) [52], with advantage of productive, fast, and clean. On the one hand, CVD-grown vdW HSs usually have less interlayer contamination compared to the ones constructed by the 'transfer and stack' method.…”