Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/75901
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
Publisher: Nature Publishing Group
Source: Nature communications, 2017, v. 8, 486 How to cite?
Journal: Nature communications 
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.
URI: http://hdl.handle.net/10397/75901
ISSN: 2041-1723
EISSN: 2041-1723
DOI: 10.1038/s41467-017-00640-2
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

3
Citations as of May 11, 2018

WEB OF SCIENCETM
Citations

3
Citations as of May 19, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.