Mapping Modified Electronic Levels in the Moiré Patterns in MoS2/WSe2 Using Low-Loss EELS | Zendy

Sandhya Susarla | Zendy; Lucas M. Sassi | Zendy; Alberto Zobelli | Zendy; Steffi Y. Woo | Zendy; Luiz H. G. Tizei | Zendy; Odile Stéphan | Zendy; Pulickel M. Ajayan | Zendy

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Mapping Modified Electronic Levels in the Moiré Patterns in MoS₂/WSe₂ Using Low-Loss EELS

Author(s) -

Sandhya Susarla,

Lucas M. Sassi,

Alberto Zobelli,

Steffi Y. Woo,

Luiz H. G. Tizei,

Odile Stéphan,

Pulickel M. Ajayan

Publication year - 2021

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.1c00984

Subject(s) - moiré pattern , heterojunction , supercell , exciton , scanning transmission electron microscopy , stacking , condensed matter physics , materials science , spectroscopy , electron energy loss spectroscopy , molecular physics , superstructure , twist , transmission electron microscopy , optics , chemistry , optoelectronics , physics , nanotechnology , geometry , thunderstorm , organic chemistry , quantum mechanics , meteorology , thermodynamics , mathematics

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 2 /WSe 2 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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