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Dynamic Tuning of Moiré Superlattice Morphology by Laser Modification

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Title
Dynamic Tuning of Moiré Superlattice Morphology by Laser Modification
Author(s)
Wang, Xinyun; Zhao, Yuzhou; Xiao Kong; Zhang, Qi; Ng, Hong Kuan; Lim, Sharon Xiaodai; Zheng, Yue; Wu, Xiao; Watanabe, Kenji; Xu, Qing-Hua; Taniguchi, Takashi; Eda, Goki; Goh, Kuan Eng Johnson; Jin, Song; Loh, Kian Ping; Feng Ding; Sun, Wanxin; Sow, Chorng Haur
Publication Date
2022-05
Journal
ACS Nano, v.16, no.5, pp.8172 - 8180
Publisher
American Chemical Society
Abstract
© In artificial van der Waals (vdW) layered devices, twisting the stacking angle has emerged as an effective strategy to regulate the electronic phases and optical properties of these systems. Along with the twist registry, the lattice reconstruction arising from vdW interlayer interaction has also inspired significant research interests. The control of twist angles is significantly important because the moiré periodicity determines the electron propagation length on the lattice and the interlayer electron-electron interactions. However, the moiré periodicity is hard to be modified after the device has been fabricated. In this work, we have demonstrated that the moiré periodicity can be precisely modulated with a localized laser annealing technique. This is achieved with regulating the interlayer lattice mismatch by the mismatched lattice constant, which originates from the variable density of sulfur vacancy generated during laser modification. The existence of sulfur vacancy is further verified by excitonic emission energy and lifetime in photoluminescence measurements. Furthermore, we also discover that the mismatched lattice constant has the equivalent contribution as the twist angle for determining the lattice mismatch. Theoretical modeling elaborates the moiré-wavelength-dependent energy variations at the interface and mimics the evolution of moiré morphology.
URI
https://pr.ibs.re.kr/handle/8788114/11933
DOI
10.1021/acsnano.2c01625
ISSN
1936-0851
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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