AI Article Synopsis
- Electronic and optical behaviors in two-dimensional materials are heavily influenced by moiré superlattices, which are created by slight misalignments in layered materials.
- Using advanced cryogenic techniques, researchers simultaneously captured the structural changes and the behavior of low-energy excitons in a specific rotated configuration of WS-WSe moiré superlattice.
- Their findings show that the exciton wave function is tightly confined around certain stacking sites, suggesting that manipulating strain on a nanoscale can lead to new properties and functionalities in these materials.
Article Abstract
Electronic and optical excitations in two-dimensional systems are distinctly sensitive to the presence of a moiré superlattice. We used cryogenic transmission electron microscopy and spectroscopy to simultaneously image the structural reconstruction and associated localization of the lowest-energy intralayer exciton in a rotationally aligned WS-WSe moiré superlattice. In conjunction with optical spectroscopy and ab initio calculations, we determined that the exciton center-of-mass wave function is confined to a radius of approximately 2 nanometers around the highest-energy stacking site in the moiré unit cell. Our results provide direct evidence that atomic reconstructions lead to the strongly confining moiré potentials and that engineering strain at the nanoscale will enable new types of excitonic lattices.
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| http://dx.doi.org/10.1126/science.add9294 | DOI Listing |
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