Exploring chiroptical effect in large angle commensurately twisted multilayer WS₂

The intrinsic breaking of mirror symmetry by structural chirality in twisted multilayer van der Waals materials provides an attractive platform for the exploration of programmable chiral properties. However, in twisted moiré structures, there exists an inherent tradeoff between structural chirality and the degree of interlayer coupling. Recently, phenomena such as enhanced conductivity and strong moiré excitons have been observed in a novel class of twisted van der Waals materials, large angle commensurately twisted moiré bilayers, in which high symmetry points in reciprocal space are coupled to each other via Umklapp scattering. Here, we leverage the unique interlayer coupling to imprint the structural chirality of twisted moiré structures onto the electronic and excitonic structure of WS₂, which we observe through optical spectroscopic methods. This study provides new insights into the exploration of moiré physics using optical probes.