Dynamic Tuning of Moiré Superlattice Morphology by Laser Modification.

Autor:	Wang X; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542.; Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore 117546., Zhao Y; Department of Chemistry, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States., Kong X; Centre for Multidimensional Carbon Materials, Institute for Basic Science, Ulsan, Korea 44919., Zhang Q; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542., Ng HK; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542., Lim SX; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542., Zheng Y; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542.; Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore 117546., Wu X; Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543., Watanabe K; Research Center for Functional Materials, National Institute for Materials Science, Namiki Tsukuba, Ibaraki Japan 305-0044., Xu QH; Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543., Taniguchi T; International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Namiki Tsukuba, Ibaraki Japan 305-0044., Eda G; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542.; Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore 117546.; Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543., Goh KEJ; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542.; Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Singapore 138634.; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371., Jin S; Department of Chemistry, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States., Loh KP; Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore 117546.; Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543., Ding F; Centre for Multidimensional Carbon Materials, Institute for Basic Science, Ulsan, Korea 44919., Sun W; Bruker Nano Surface Division, 30 Biopolis Street 09-01, The Matrix, Singapore 138671., Sow CH; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542.; Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore 117546.
Jazyk:	angličtina
Zdroj:	ACS nano [ACS Nano] 2022 May 24; Vol. 16 (5), pp. 8172-8180. Date of Electronic Publication: 2022 May 16.
DOI:	10.1021/acsnano.2c01625
Abstrakt:	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.
Databáze:	MEDLINE
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