Helicity resolved Raman scattering of MoS2, MoSe2, WS2 and WSe2 atomic layers

Abstract

The two-fold valley degeneracy in two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDCs) (Mo,W)(S,Se)2 is suitable for "valleytronics", the storage and manupulation of information utilizing the valley degree of freedom. The conservation of luminescent photon helicity in these 2D crystal monolayers has been widely regarded as a benchmark indicator for charge carrier valley polarization. Here we perform helicity-resolved Raman scattering of the TMDC atomic layers. In drastic contrast to luminescence, the dominant first-order zone-center Raman bands, including the low energy breathing and shear modes as well as the higher energy optical phonons, are found to either maintain or completely switch the helicity of incident photons. These experimental observations, in addition to providing a useful tool for characterization of TMDC atomic layers, shed new light on the connection between photon helicity and valley polarization.

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• Coulomb-bound four- and five-particle valleytronic states in an atomically-thin semiconductor
• Chemical Vapor Deposition Synthesized Atomically Thin Molybdenum Disulfide with Optoelectronic-Grade Crystalline Quality
• Resonance effects in the Raman scattering of mono- and few layers MoSe${}_2$
• Mapping of Low-Frequency Raman Modes in CVD-Grown Transition Metal Dichalcogenides: Layer Number, Stacking Orientation and Resonant Effects
• Davydov splitting and excitonic resonance effects in Raman spectra of few-Layer MoSe2
• Entanglement of single-photons and chiral phonons in atomically thin WSe${}_2$
• Unified description of the optical phonon modes in $N$-layer MoTe${}_2$
• Activation of new Raman modes by inversion symmetry breaking in type II Weyl semimetal candidate T'-MoTe2
• Light matter interaction in transition metal dichalcogenides and their heterostructures
• Strain-shear coupling in bilayer MoS2
• Distinct spin-lattice and spin-phonon interactions in monolayer magnetic CrI${}_3$
• Tuning the Fröhlich exciton-phonon scattering in monolayer MoS2
• Low-Frequency Raman Spectroscopy of Few-Layer 2H-SnS2
• Ultralow-frequency collective compression mode and strong interlayer coupling in multilayer black phosphorus
• Stacking-Dependent Interlayer Phonons in 3R and 2H MoS${}_2$
• Ideal type-II Weyl phonons in wurtzite CuI
• Observation of anisotropic interlayer Raman modes in few-layer ReS2
• Probing the uniaxial strains in MoS${}_2$ using polarized Raman spectroscopy: A first-principles study
• Strain enhanced superconductivity of Mo$X_2$ ($X$=S or Se) bilayers with Na intercalation
• Superior valley polarization and coherence of 2s excitons in monolayer WSe2
• Excitonic Resonance Effects and Davydov Splitting in Circularly Polarized Raman Spectra of Few-Layer WSe2
• Circular phonon dichroism in Weyl semimetals
• Recent Progress of Heterostructures Based on Two Dimensional Materials and Wide Bandgap Semiconductors
• Low-frequency Raman scattering in WSe${}_2$-MoSe${}_2$ heterobilayers: Evidence for atomic reconstruction
• Chiral phonons in honeycomb sublattice of layered CoSn-like compounds
• Low wavenumber Raman spectroscopy of highly crystalline MoSe2 grown by chemical vapor deposition
• The optical signature of few-layer ReSe${}_2$
• QERaman: An open-source program for calculating resonance Raman spectra based on Quantum ESPRESSO
• Highly Accurate, Reliable and Non-Contaminating Two-Dimensional Material Transfer System
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Chiral valley phonons and flat phonon bands in moiré materials
• Adiabatic dynamics of coupled spins and phonons in magnetic insulators
• Valley polarization of exciton-polaritons in monolayer WSe2 in a tunable microcavity
• Up- and Down-Conversion between Intra- and Inter-Valley Excitons in Waveguide Coupled Monolayer WSe2
• Helicity-selective Raman scattering from in-plane anisotropic α-MoO${}_3$
• Direct Observation of Intravalley Phonon Scattering of 2s Excitons in MoSe${}_2$ and WSe${}_2$ Monolayers
• Phonons in MoSe2/WSe2 van der Waals heterobilayer
• Exciton-activated effective phonon magnetic moment in monolayer MoS2
• Low-frequency Raman signature of Ag-intercalated few-layer MoS${}_2$
• Ultrafast charge dynamics and photoluminescence in bilayer MoS2
• Optical Phonon Limited High Field Transport in Layered Materials
• Flat and tunable moire phonons in twisted transition-metal dichalcogenides
• Breathing modes in few-layer MoTe${}_2$ activated by h-BN encapsulation
• Raman Forbidden Layer-Breathing Modes in Layered Semiconductor Materials Activated by Phonon and Optical Cavity Effects
• Insights into hyperbolic phonon polaritons in hBN using Raman scattering from encapsulated transition metal dichalcogenide layers
• Chiral phonons in binary compounds $A$Bi ($A$ = K, Rb, Cs) with P2${}_1$/c structure
• Morphology-induced spectral modification of self-assembled WS2 pyramids
• Helicity resolved Raman spectroscopy of mono- and a few-layers thick PtSe${}_2$
• PARPHOM: PARallel PHOnon calculator for Moiré systems
• Directing Monolayer Tungsten Disulfide Photoluminescence using a Bent Plasmonic Nanowire on a Mirror Cavity
• Raman tensor for two-dimensional massive Dirac fermions
• Two-Dimensional Transition Metal Dichalcogenides-Based Counter Electrodes for Dye-Sensitized Solar Cells
• Phonon pseudoangular momentum in $\alpha$-MoO${}_3$
• Chiral phonon in the cubic system based on the Laves phase of $A$Bi${}_2$ ($A=$K, Rb, Cs)
• Plasmonic nanocavity-enabled universal detection of layer-breathing vibrations in two-dimensional materials
• Trapping the carrier in the spin-locked MoS2 atomic valley by absorption of chiral L-cysteine
• Divergent phonon angular momentum driven by temperature and strain
• Charged bosons made of fermions in a solid state system without Cooper pairing
• Excitation energy dependence of Raman spectra of few-layer WS2
• Revealing the nanogeometry of WS2 nanoflowers by polarization-resolved Raman spectroscopy
• Raman scattering and anomalous Stokes anti-Stokes ratio in MoTe2 atomic layers
• Quasi-bound layer-breathing phonons inside perfect dislocations of lattice-relaxed twisted bilayers
• Mechanical Detuning of Exciton-Phonon Resonance in WS2
• Kolmogorov-Crespi Potential For Multilayer Transition Metal Dichalcogenides: Capturing Structural Transformations In Moiré Superlattices