Observation of interlayer phonon modes in van der Waals heterostructures

Abstract

We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers as well as twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30 ~ 40 cm-1) that arise from the layer-breathing mode (LBM) vibrations between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and atomically clean interface. Its frequency also evolves systematically with the relative orientation between of the two layers. Our research demonstrates that LBM can serve as a sensitive probe to the interface environment and interlayer interactions in van der Waals materials.

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• Coupling and stacking order of ReS2 atomic layers revealed by ultralow-frequency Raman spectroscopy
• Mapping of Low-Frequency Raman Modes in CVD-Grown Transition Metal Dichalcogenides: Layer Number, Stacking Orientation and Resonant Effects
• First-principles investigation of graphene/MoS2 bilayer heterostructures using Tkatchenko-Scheffler van der Waals method
• Polytypism and Unexpected Strong Interlayer Coupling of two-Dimensional Layered ReS2
• 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
• Imaging of interlayer coupling in van der Waals heterostructures using a bright-field optical microscope
• Materials properties of out-of-plane heterostructures of MoS${}_2$-WSe${}_2$ and WS${}_2$-MoSe${}_2$
• Spectroscopic Signatures of Interlayer Coupling in Janus MoSSe/MoS2 Heterostructures
• Seebeck Coefficient of a Single van der Waals Junction in Twisted Bilayer Graphene
• Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures
• Stacking-Dependent Interlayer Phonons in 3R and 2H MoS${}_2$
• Large-scale mapping of moiré superlattices by Raman imaging of interlayer breathing mode and moiré phonons
• Observation of anisotropic interlayer Raman modes in few-layer ReS2
• Interlayer bond polarizability model for stacking-dependent low-frequency Raman scattering in layered materials
• Interlayer Coupling in Two-Dimensional Semiconductor Materials
• Low-frequency Raman scattering in WSe${}_2$-MoSe${}_2$ heterobilayers: Evidence for atomic reconstruction
• Ultrafast coherent interlayer phonon dynamics in atomically thin layers of MnBi2Te4
• Light-matter interaction in van der Waals heterostructures
• Interlayer Charge Transfer and Defect Creation in Type I van der Waals Heterostructures
• Extraordinary high room-temperature carrier mobility in graphene-WSe${}_2$ heterostructures
• Rigid-layer Raman-active modes in $N$-layer Transition Metal Dichalcogenides: interlayer force constants and hyperspectral Raman imaging
• Moiré-induced Vibrational Coupling in Double Walled Carbon Nanotubes
• The optical response of artificially twisted MoS${}_2$ bilayers
• Interlayer exciton-polaron in atomically thin semiconductors
• Phonons in MoSe2/WSe2 van der Waals heterobilayer
• Interlayer Resistance of Misoriented MoS2
• Exchange-bias controlled correlations in magnetically encapsulated twisted van der Waals dichalcogenides
• Thermal boundary conductance and phonon transmission in hexagonal boron nitride/graphene heterostructures
• Spectrally tunable, large Raman enhancement from nonradiative energy transfer in van der Waals heterostructure
• Coherent Modulation of Two-Dimensional Moiré States with On-Chip THz Waves
• Spin-orbit correlations and exchange-bias control in twisted Janus dichalcogenide multilayers
• Temperature Dependent Layer Breathing Modes in Two Dimensional Materials
• Spontaneous interlayer compression in commensurately stacked van der Waals heterostructures
• Suppression of the Shear Raman Mode in Defective Bilayer MoS2
• Terahertz field effect in a two-dimensional semiconductor MoS2
• Robustness of momentum-indirect interlayer excitons in MoS2/WSe2 heterostructure against charge carrier doping
• Enhancement of the WS${}_2$ A${}_{1\text{g}}$ Raman Mode in MoS${}_2$/WS${}_2$ Heterostructures