Tunable inverted gap in monolayer quasi-metallic MoS₂ induced by strong charge-lattice coupling.

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 (~0.50 eV) and a fundamental gap (~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

SUBMITTER: Yin X 

PROVIDER: S-EPMC5589873 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature