期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-017-00640-2
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资金
- National Natural Science Foundation of China [51472164]
- Natural Science Foundation of SZU [000050]
- 1000 Talents Program for Young Scientists of China
- Shenzhen Peacock Plan [KQTD2016053112042971]
- Educational Commission of Guangdong Province [2015KGJHZ006]
- Science and Technology Planning Project of Guangdong Province [2016B050501005]
- China Postdoctoral Science Foundation [2016M600664]
- Singapore National Research Foundation [NRF-CRP8-2011-06, NRF-CRP15-2015-01]
- MOE [MOE2015-T2-1-099, MOE2015-T2-2-147]
- PHC Merlion Project
- FRC [R-144-000-368-112, R-144-000-346-112, R-144-000-364-112]
Polymorphism of two-dimensional transition metal dichalcogenides such as molybdenum disulfide (MoS2) exhibit fascinating optical and transport properties. Here, we observe a tunable inverted gap (similar to 0.50 eV) and a fundamental gap (similar to 0.10 eV) in quasimetallic monolayer MoS2. Using spectral-weight transfer analysis, we find that the inverted gap is attributed to the strong charge-lattice coupling in two-dimensional transition metal dichalcogenides ( 2D-TMDs). A comprehensive experimental study, supported by theoretical calculations, is conducted to understand the transition of monolayer MoS2 on gold film from trigonal semiconducting 1H phase to the distorted octahedral quasimetallic 1T' phase. We clarify that electron doping from gold, facilitated by interfacial tensile strain, is the key mechanism leading to its 1H-1T' phase transition, thus resulting in the formation of the inverted gap. Our result shows the importance of charge-lattice coupling to the intrinsic properties of the inverted gap and polymorphism of MoS2, thereby unlocking new possibilities for 2D-TMD-based device fabrication.
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