Phonon renormalization in reconstructed MoS2 moiré superlattices

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 MoS 2 twisted bilayers, adding an insight to mo...

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Veröffentlicht in:Nature materials Jg. 20; H. 8; S. 1100 - 1105
Hauptverfasser: Quan, Jiamin, Linhart, Lukas, Lin, Miao-Ling, Lee, Daehun, Zhu, Jihang, Wang, Chun-Yuan, Hsu, Wei-Ting, Choi, Junho, Embley, Jacob, Young, Carter, Taniguchi, Takashi, Watanabe, Kenji, Shih, Chih-Kang, Lai, Keji, MacDonald, Allan H., Tan, Ping-Heng, Libisch, Florian, Li, Xiaoqin
Format: Journal Article
Sprache:Englisch
Veröffentlicht: London Nature Publishing Group UK 01.08.2021
Nature Publishing Group
Springer Nature - Nature Publishing Group
Schlagworte:
140/133
639/624
639/925
Bilayers
Biomaterials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Continuum modeling
Crystal lattices
Crystals
Lattice vibration
Materials Science
Molybdenum disulfide
Nanotechnology
Optical and Electronic Materials
Optical properties
Phonons
Physics
Spectrum analysis
Superlattices
ISSN:1476-1122, 1476-4660, 1476-4660
Online-Zugang:Volltext
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Zusammenfassung: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 MoS 2 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. Raman measurements of twisted bilayer MoS 2 as a function of twist angles, with theoretical support, reveal phonon renormalization in this moiré superlattice.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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SC0019398
USDOE Office of Science (SC)
ISSN:1476-1122
1476-4660
1476-4660
DOI:10.1038/s41563-021-00960-1