Anomalous Lattice Vibrations of Single and Few-Layer MoS2

Abstract

Molybdenum disulfide (MoS2) of single and few-layer thickness was exfoliated on SiO2/Si substrate and characterized by Raman spectroscopy. The number of S-Mo-S layers of the samples was independently determined by contact-mode atomic-force microscopy. Two Raman modes, E12g and A1g, exhibited sensitive thickness dependence, with the frequency of the former decreasing and that of the latter increasing with thickness. The results provide a convenient and reliable means for determining layer thickness with atomic-level precision. The opposite direction of the frequency shifts, which cannot be explained solely by van der Waals interlayer coupling, is attributed to Coulombic interactions and possible stacking-induced changes of the intralayer bonding. This work exemplifies the evolution of structural parameters in layered materials in changing from the 3-dimensional to the 2-dimensional regime.

14 pages, 4 figures

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• Neutral atom scattering based mapping of atomically thin layers
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• Defect-Moderated Oxidative Etching of MoS2
• Raman spectroscopy of few-layers TaS${}_2$ and Mo-doped TaS${}_2$ with enhanced superconductivity
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• On the Origin of Metallicity and Stability of the Metastable Phase in Chemically Exfoliated MoS${}_2$
• Exciton-Sensitized Second-Harmonic Generation in 2D Heterostructures
• Magneto photoluminescence measurements of tungsten disulphide monolayers
• Carrier Injection and Scattering in Atomically Thin Chalcogenides
• Resonant Raman Scattering of Few Layers CrBr${}_3$
• Growth and Properties of Dislocated Two-dimensional Layered Materials
• Pump-triple sum-frequency-probe spectroscopy of transition metal dichalcogenides
• Prediction of Two-Dimensional Monochalcogenides: MoS and WS
• Suppression of the Shear Raman Mode in Defective Bilayer MoS2
• A simple KPFM-based approach for electrostatic-free topographic measurements: the case of MoS${}_2$ on SiO${}_2$
• Electron-phonon correlations on spin texture of gapped helical Dirac Fermions
• Defects, band bending and ionization rings in MoS2
• Signatures of van Hove singularities in the anisotropic in-plane optical conductivity of the topological semimetal Nb${}_3$SiTe${}_6$
• Isolating the Nonlinear Optical Response of a MoS${}_2$ Monolayer under Extreme Screening of a Metal Substrate
• Blocking transition of interface traps in MoS${}_2$-on-SiO${}_2$ FETs
• Defects-Assisted Piezoelectric Response in Liquid Exfoliated MoS2 Nanosheets
• Metallic monoclinic phase in VO${}_2$ induced by electrochemical gating: in-situ Raman study
• Interlayer Raman modes in twisted bilayer TMDCs
• Two-Dimensional Si-Ge Monolayers: Stabilities, Structures and Electronic Properties
• Anomalous metallic phase in molybdenum disulphide induced via gate-driven organic ion intercalation
• Demonstration of Spatial Self Phase Modulation based photonic diode functionality in MoS2/h-BN medium
• Infrared study of Large scale h-BN film and Graphene/h-BN heterostructure
• Layer-dependent Raman spectroscopy of ultrathin Ta${}_2$Pd${}_3$Te${}_5$
• Optically Facet-Resolved Reaction Anisotropy in Two-Dimensional Transition Metal Dichalcogenides
• Photoluminescence kinetics of dark and bright excitons in atomically thin MoS${}_2$
• Morphology-induced spectral modification of self-assembled WS2 pyramids
• Absorbance Enhancement of Monolayer MoS${}_2$ in a Perfect Absorbing System
• One-Dimensional Edge Contact to Encapsulated MoS2 with a Superconductor
• Uni-Traveling-Carrier Photodiode Based on MoS2/GaN van der Waals Heterojunction for High-Speed Visible-Light Detection
• Contrast inversion in neutral atom microscopy using atomic cluster beams
• Direct transformation of crystalline MoO${}_3$ into few-layers MoS${}_2$
• Doping effects on charge density instability in non-centrosymmetric PbxTaSe2
• Effects of Reduced Interlayer Interactions on the K-point Excitons of MoS${}_2$ Nanoscrolls
• Exfoliation and Optical Properties of S=1 Triangular Lattice Antiferromagnet NiGa${}_2$S${}_4$
• Slippery Polymer Monoliths: Surface Functionalization with Ordered MoS2 Microparticle Arrays
• Optically tunable spin Hall effect in periodically driven monolayer transition metal dichalcogenides
• Silicon nanoantennas for tailoring the optical properties of MoS2 monolayers
• Impact of a $Mo{S}_2$ monolayer on the nanoscale thermoelastic response of silicon heterostructures
• Enhanced chemical vapour deposition of monolayer MoS2 films via a clean promoter
• Strained 2D TMD lateral heterojunctions via grayscale thermal-Scanning Probe Lithography
• Defect Passivation and Förster-Type Energy Exchange in H2Pc-TMD Organic-Inorganic Heterostructures
• Investigating the Ferroelectric Potential Landscape of 3R-MoS${}_2$ through Optical Measurements
• Ubiquitous Antiparallel Domains in 2D Hexagonal Boron Nitride Uncovered by Interferometric Nonlinear Optical Imaging
• Optical microscope based universal parameter for identifying layer number in two-dimensional materials
• Tuning Bandgap and Energy Stability of Organic-Inorganic Halide Perovskites through Surface Engineering
• Magnetic field tuning of modulated magnetic orders in CrOCl at the two-dimensional limit
• Revealing the nanogeometry of WS2 nanoflowers by polarization-resolved Raman spectroscopy
• Phonon Renormalization in Reconstructed MoS${}_2$ Moiré Superlattices
• Electronic Raman scattering from 2D metals with broken inversion symmetry
• Tunable phononic coupling in excitonic quantum emitters