Speaker
Description
Twisted trilayer (Tt) transition metal dichalcogenides with their multiple rotational degrees of freedom offer unprecedented opportunities for the formation of large-wavelength moiré superlattices to maximize the effect of correlated behaviors. However, precisely stacking trilayer structures to realize ultra-large-wavelength moiré superlattices with a deep moiré potential remains a significant challenge, hindering investigations of moiré-tuned many-body excitonic properties. Here we directly fabricate Tt MoS2 homostructures via chemical vapor deposition, in which two commensurate twists of 2.7° and 21.9° are sequentially introduced from the top to middle, and to bottom layers. An unprecedented super-moiré structure with an ultra-large periodicity of around 24 nm is achieved in the 2.7°/21.9° Tt MoS2, which is hierarchally composed by periodical mirror-symmetric triangular tessellation patterns consisting of five different kinds of high-symmetric stacking registrations and the relaxation regions resulting from the interlayer gliding. This robust ultra-large-period super-moiré structure generates a deep moiré potential to effectively limit the intralayer moiré excitons recombination associated with the enhanced layer-locked valley polarization by 2-fold larger than that of the trilayer systems with incommensurate angles. Our work presents angle-dependent super-moiré architectures in Tt systems as a versatile platform for designing moiré quantum materials with tailored optoelectronic responses, advancing applications in valleytronic and excitonic devices.
| Session Selection | Condensed Matter |
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