Deep Moiré Potential and Absence of Layer Polarization in Twisted Trilayer WS<sub>2</sub>

Twisted transition metal dichalcogenides (TMDs) hetero/homobilayers have been extensively reported to exhibit strongly correlated states and interfacial ferroelectricity. It is reasonable to anticipate that the twist angle could also significantly influence the electronic properties of multilayer TMDs. However, the quantitative study of moiré potential and the exploration of interlayer charge transfer in twisted multilayer TMDs have not been carried out. Here, using scanning tunneling microscopy and spectroscopy, we study the structure and in situ electronic properties of a twisted trilayer WS<sub>2</sub> (TT-WS<sub>2</sub>) with twist angles of 3.35° and 0.35°. A "double-moiré" superlattice structure is detected, consisting of a completely reconstructed moiré into triangular domains and an unreconstructed one. Through comparing with the electronic properties of twisted bilayer WS<sub>2</sub>, we observe a significantly enhanced moiré potential up to 200 meV and the absence of layer polarization in the TT-WS<sub>2</sub>. Our results pave the way for further research and application of twisted multilayer TMDs.

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Publication Details

Journal
Nano Letters
Published
2025-04-16
DOI
https://doi.org/10.1021/acs.nanolett.5c00259
Primary Topic
2D Materials and Applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Deep Moiré Potential and Absence of Layer Polarization in Twisted Trilayer WS2

Kaihui Li, Charles Zhang, Shiying Liu, Jinding Zhang et al.
Nano Letters
2D Materials and Applications
article

Deep Moiré Potential and Absence of Layer Polarization in Twisted Trilayer WS2

Kaihui Li, Charles Zhang, Shiying Liu, Jinding Zhang, Wenhao Hu, Qi Zheng, Yulong Xiao, Anlian Pan, Xueying Liu, Siyu Li
article en

Abstract

Twisted transition metal dichalcogenides (TMDs) hetero/homobilayers have been extensively reported to exhibit strongly correlated states and interfacial ferroelectricity. It is reasonable to anticipate that the twist angle could also significantly influence the electronic properties of multilayer TMDs. However, the quantitative study of moiré potential and the exploration of interlayer charge transfer in twisted multilayer TMDs have not been carried out. Here, using scanning tunneling microscopy and spectroscopy, we study the structure and in situ electronic properties of a twisted trilayer WS<sub>2</sub> (TT-WS<sub>2</sub>) with twist angles of 3.35° and 0.35°. A "double-moiré" superlattice structure is detected, consisting of a completely reconstructed moiré into triangular domains and an unreconstructed one. Through comparing with the electronic properties of twisted bilayer WS<sub>2</sub>, we observe a significantly enhanced moiré potential up to 200 meV and the absence of layer polarization in the TT-WS<sub>2</sub>. Our results pave the way for further research and application of twisted multilayer TMDs.

Nano LettersVol. 25(17)
Hunan University (CN), Hunan Normal University (CN), Bay Institute (US), Integrated Optoelectronics (Norway) (NO)
National Natural Science Foundation of China, National Key Research and Development Program of China, Basic and Applied Basic Research Foundation of Guangdong Province
Climate action
Openalex Percentile: Top 95%
2D Materials and Applications
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