Two-Dimensional Spiral: A Promising Moiré Superlattice

Abstract

Moiré superlattices based on 2D layered materials have become an excellent platform for exploring new physics and developing novel optoelectronic devices. Recently, the 2D spirals have been proved to be a new kind of moiré superlattices. Unlike previous moiré superlattices usually assembled by directly stacking monolayers or multilayers, 2D spiral moiré superlattices (SMS) are realized in a scalable and direct way through chemical synthesis. All three spatial dimensions and interlayer rotation of SMS can be precisely designed and controlled by combining the screw-dislocations-driven (SDD) growth mechanisms using flat or conical surfaces. Meanwhile, the spiral is a continuously single-layer rotating stacking structure, which provides a channel for developing novel correlated quantum electronic devices. In this review, it focuses on recent progress on SMS materials, including the material synthesis mechanism and the unique properties of these spirals in the optical, optoelectronic, thermal, mechanical as well as catalytic fields. Finally, the challenges and future perspectives of this emerging field are briefly discussed.