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Title: | Tunable inverted gap in monolayer quasi-metallic MoS2 induced by strong charge-lattice coupling | Authors: | Yin, XM Wang, QX Cao, L Tang, CS Luo, X Zheng, YJ Wong, LM Wang, SJ Quek, SY Zhang, WJ Rusydi, A Wee, ATS |
Issue Date: | 2017 | Source: | Nature communications, 7 2017, v. 8, no. , 486, p. 1-9 | Abstract: | 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. | Publisher: | Nature Publishing Group | Journal: | Nature communications | ISSN: | 2041-1723 | EISSN: | 2041-1723 | DOI: | 10.1038/s41467-017-00640-2 | Rights: | Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/. © The Author(s) 2017 The following publication Yin, X., Wang, Q., Cao, L. et al. Tunable inverted gap in monolayer quasi-metallic MoS2 induced by strong charge-lattice coupling. Nat Commun 8, 486 (2017) is available at https://dx.doi.org/10.1038/s41467-017-00640-2 |
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