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Article Dans Une Revue Nano Letters Année : 2021

Mapping Modified Electronic Levels in the Moiré Patterns in MoS 2 /WSe 2 Using Low-Loss EELS

Résumé

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 MoS2/WSe2 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 AA stacking.
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Dates et versions

hal-03370455 , version 1 (13-10-2021)

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Sandhya Susarla, Lucas M. Sassi, Alberto Zobelli, Steffi y Woo, Luiz Tizei, et al.. Mapping Modified Electronic Levels in the Moiré Patterns in MoS 2 /WSe 2 Using Low-Loss EELS. Nano Letters, 2021, 21 (9), pp.4071-4077. ⟨10.1021/acs.nanolett.1c00984⟩. ⟨hal-03370455⟩
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