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Title: MoS2/h-BN heterostructures: controlling MoS2 crystal morphology by chemical vapor deposition
Award ID(s):
1538127
PAR ID:
10026111
Author(s) / Creator(s):
; ; ;
Date Published:
Journal Name:
Journal of Materials Science
Volume:
52
Issue:
12
ISSN:
0022-2461
Page Range / eLocation ID:
7028 to 7038
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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    In moiré crystals formed by stacking van der Waals materials, surprisingly diverse correlated electronic phases and optical properties can be realized by a subtle change in the twist angle. Here, we discover that phonon spectra are also renormalized in MoS2 twisted bilayers, adding an insight to moiré physics. Over a range of small twist angles, the phonon spectra evolve rapidly owing to ultra-strong coupling between different phonon modes and atomic reconstructions of the moiré pattern. We develop a low-energy continuum model for phonons that overcomes the outstanding challenge of calculating the properties of large moiré supercells and successfully captures the essential experimental observations. Remarkably, simple optical spectroscopy experiments can provide information on strain and lattice distortions in moiré crystals with nanometre-size supercells. The model promotes a comprehensive and unified understanding of the structural, optical and electronic properties of moiré superlattices. 
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