Mapping Modified Electronic Levels in the Moiré Patterns in MoS<sub>2</sub>/WSe<sub>2</sub> Using Low-Loss EELS.
basic_science · Level V
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- Record sourced from PubMed, PMID 33900086.
- Also identified by DOI 10.1021/acs.nanolett.1c00984.
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Abstract
Hybrid/moiré interlayer and intralayer excitons have been realized in twisted two-dimensional transition metal chalcogenides (2D-TMD) due to variation in local moiré potential within a moiré supercell. Though moiré excitons have been detected in TMD heterostructures by macroscopic spectroscopic techniques, their spatial distribution is experimentally unknown. In the present work, using high-resolution scanning transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS), we explore the effect of the twist angle in MoS<sub>2</sub>/WSe<sub>2</sub> heterostructures. We observe weak interaction between the layers at higher twist angles (>5°) and stronger interaction for lower twist angles. The optical response of the heterostructure varies within the moiré supercell, with a lower energy absorption peak appearing in regions with the <i>AA</i> stacking.