Exciton-phonon coupling in MoSe2 monolayers

Abstract

We study experimentally and theoretically the exciton-phonon interaction in MoSe2 monolayers encapsulated in hexagonal BN, which has an important impact on both optical absorption and emission processes. The exciton transition linewidth down to 1 meV at low temperatures makes it possible to observe high energy tails in absorption and emission extending over several meV, not masked by inhomogeneous broadening. We develop an analytical theory of the exciton-phonon interaction accounting for the deformation potential induced by the longitudinal acoustic phonons, which plays an important role in exciton formation. The theory allows fitting absorption and emission spectra and permits estimating the deformation potential in MoSe2 monolayers. We underline the reasons why exciton-phonon coupling is much stronger in two-dimensional transition metal dichalcodenides as compared to conventional quantum well structures. The importance of exciton-phonon interactions is further highlighted by the observation of a multitude of Raman features in the photoluminescence excitation experiments.

12 pages, 5 figures

References in corpus (42)

• Atomically thin MoS2: A new direct-gap semiconductor
• Van der Waals heterostructures
• 2D materials and van der Waals heterostructures
• Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
• Excitons in atomically thin transition metal dichalcogenides
• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Optical Spectrum of MoS${}_2$: Many-body Effects and Diversity of Exciton States
• Phonons in single and few-layer MoS2 and WS2
• First-principles study of the phonon-limited mobility in n-type single-layer MoS2
• Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
• Tightly bound excitons in monolayer WSe2
• Probing Excitonic Dark States in Single-layer Tungsten Disulfide
• Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
• Non-linear Optical Spectroscopy of Excited Exciton States for Efficient Valley Coherence Generation in WSe2 Monolayers
• Intrinsic Exciton Linewidth in Monolayer Transition Metal Dichalcogenides
• Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
• Exciton Radiative Lifetime in Transition Metal Dichalcogenide Monolayers
• Intrinsic Electrical Transport Properties of Monolayer Silicene and MoS2 from First Principles
• Intrinsic Transport Properties of Electrons and Holes in Monolayer Transition Metal Dichalcogenides
• Charged excitons in monolayer WSe${}_2$: experiment and theory
• Exciton fine structure and spin decoherence in monolayers of transition metal dichalcogenides
• Optical properties of atomically thin transition metal dichalcogenides: Observations and puzzles
• Phonon Softening and Direct to Indirect Bandgap Crossover in Strained Single Layer MoSe2
• Control of biaxial strain in single-layer Molybdenite using local thermal expansion of the substrate
• Valley-spin polarized Landau levels in a monolayer semiconductor
• Phonon Sidebands in Transition Metal Dichalcogenides
• Polarization analysis of excitons in monolayer and bilayer transition-metal dichalcogenides
• Resonance effects in the Raman scattering of mono- and few layers MoSe${}_2$
• Enabling valley selective exciton scattering in monolayer WSe${}_2$ through upconversion
• Double resonance Raman modes in mono- and few-layer MoTe${}_2$
• Optical spectroscopy of excited exciton states in MoS2 monolayers in van der Waals heterostructures
• Raman scattering excitation spectroscopy in monolayer WS${}_2$
• Unusual Exciton-Phonon Interactions at van der Waals Engineered Interfaces
• Direct measure of the exciton formation in quantum wells from time resolved interband luminescence
• Double resonant Raman scattering and valley coherence generation in monolayer WSe2
• Polariton resonances for ultra-strong coupling cavity optomechanics in GaAs/AlAs multiple quantum wells
• Phonon-assisted oscillatory exciton dynamics in monolayer MoSe2
• Theory of intervalley Coulomb interactions in monolayer transition-metal dichalcogenides
• Exciton formation assisted by longitudinal optical phonons in monolayer transition metal dichalcogenides
• Fast relaxation of photo-excited carriers in 2D transition metal dichalcogenides
• Exciton-phonon relaxation bottleneck and radiative decay of thermal exciton reservoir in two-dimensional materials
• Group Theory analysis of phonons in two-dimensional Transition Metal Dichalcogenides

Cited by in corpus (63)

• Phonon-assisted Photoluminescence from Dark Excitons in Monolayers of Transition Metal Dichalcogenides
• Control of the Exciton Radiative Lifetime in van der Waals Heterostructures
• The bulk van der Waals layered magnet CrSBr is a quasi-1D material
• Exciton-Phonon Interaction and Relaxation Times from First Principles
• Guide to optical spectroscopy of layered semiconductors
• Exciton-Scattering-Induced Dephasing in Two-Dimensional Semiconductors
• Strongly coupled coherent phonons in single-layer MoS${}_2$
• Exciton states in monolayer MoSe2 and MoTe2 probed by upconversion spectroscopy
• Nonclassical Exciton Diffusion in Monolayer WSe2
• Exciton-phonon coupling strength in single-layer MoSe2 at room temperature
• Phonon wind and drag of excitons in monolayer semiconductors
• Bright excitons with negative-mass electrons
• Efficient phonon cascades in hot photoluminescence of WSe${}_2$ monolayers
• Ground and Excited Exciton Polarons in Monolayer MoSe2
• Exciton lifetime and optical linewidth profile via exciton-phonon interactions: Theory and first-principles calculations for monolayer MoS${}_2$
• Distinctive signatures of the spin- and momentum-forbidden dark exciton states in the photo-luminescences of strained WSe${}_2$ monolayers under thermalization
• Perfect absorption by an atomically thin crystal
• Virtual trions in the photoluminescence of monolayer transition-metal dichalcogenides
• Unconventional Excitonic States with Phonon Sidebands in Layered Silicon Diphosphide
• Quantum interference effect on exciton transport in monolayer semiconductors
• Exciton valley depolarization in monolayer transition-metal dichalcogenides
• Theory of absorption lineshape in monolayers of transition metal dichalcogenides
• Exciton spectroscopy and diffusion in MoSe2-WSe2 lateral heterostructures encapsulated in hexagonal boron nitride
• Spin States Protected from Intrinsic Electron-Phonon-Coupling Reaching 100 ns Lifetime at Room Temperature in MoSe${}_2$
• Electron recoil effect in electrically tunable MoSe2 monolayers
• Dimensionality and Anisotropicity Dependence of Radiative Recombination in Nanostructured Phosphorene
• Temperature induced modulation of resonant Raman scattering in bilayer 2H-MoS${}_2$
• Exciton fine structure splitting and linearly polarized emission in strained transition-metal dichalcogenide monolayers
• Skew Scattering and Side Jump Drive Exciton Valley Hall Effect in Two-Dimensional Crystals
• Real-time non-adiabatic dynamics in the one-dimensional Holstein model: Trajectory-based vs exact methods
• Analytical description of the 1s exciton linewidth temperature-dependence in transition metal dichalcogenides
• Resonance and antiresonance in Raman scattering in GaSe and InSe crystals
• Phonon signatures in spectra of exciton polaritons in transition metal dichalcogenides
• Interlayer exciton-polaron in atomically thin semiconductors
• A Reciprocal-Space Formulation of Surface Hopping
• A Reciprocal-Space Formulation of Mixed Quantum-Classical Dynamics
• Exciton diffusion in a hBN-encapsulated monolayer MoSe2
• Phonon-induced exciton weak localization in two-dimensional semiconductors
• Enhanced exciton-exciton collisions in an ultra-flat monolayer MoSe2 prepared through deterministic flattening
• Flexural deformations and collapse of bilayer two-dimensional crystals by interlayer exciton
• Impact of optically pumped non-equilibrium steady states on luminescence emission of atomically-thin semiconductor excitons
• Probing the optical near-field interaction of Mie nanoresonators with atomically thin semiconductors
• Impact of charge transfer excitons on unidirectional exciton transport in lateral TMD heterostructures
• Electromagnetic field assisted exciton diffusion in moiré superlattices
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• Coherent spin dynamics of excitons in strained monolayer semiconductors
• Longitudinal-transverse splitting and fine structure of Fermi polarons in two-dimensional semiconductors
• Coherence and de-coherence in the Time-Resolved ARPES of realistic materials: an ab-initio perspective
• Viscous hydrodynamics of excitons in van der Waals heterostructures
• Mixed quantum-classical modeling of exciton-phonon scattering in solids: Application to optical linewidths of monolayer MoS2
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• A perturbative approach to the polaron shift of excitons in transition metal dichalcogeniedes
• Effects of Reduced Interlayer Interactions on the K-point Excitons of MoS${}_2$ Nanoscrolls
• Wannier-Function-Based Approach to Coupled Exciton-Phonon-Photon Dynamics in Two-Dimensional Semiconductors
• Theory of interlayer exciton dynamics in 2D TMDCs Heterolayers under the influence of strain reconstruction and disorder
• Polarized and narrow excitonic emission from graphene-capped monolayer WS${}_2$ through resonant phonon relaxation
• Terahertz radiation induced attractive-repulsive Fermi polaron conversion in transition metal dichalcogenide monolayers
• Laterally Extended States of Interlayer Excitons in Reconstructed MoSe${}_2$/WSe${}_2$ Heterostructures
• Boltzmann transport theory of magnon-exciton drag
• Spectral asymmetry of phonon sideband luminescence in monolayer and bilayer WSe2
• Trion-phonon interaction in atomically thin semiconductors
• 2D electrons floating on a suspended atomically thin dielectric
• Suppression and amplification of phonon sidebands in transition metal dichalcogenides by optical feedback