Fine Structure and Lifetime of Dark Excitons in Transition Metal Dichalcogenide Monolayers

Abstract

The intricate interplay between optically dark and bright excitons governs the light-matter interaction in transition metal dichalcogenide monolayers. We have performed a detailed investigation of the "spin-forbidden" dark excitons in WSe2 monolayers by optical spectroscopy in an out-of-plane magnetic field Bz. In agreement with the theoretical predictions deduced from group theory analysis, magneto-photoluminescence experiments reveal a zero field splitting $\delta =0.6\pm 0.1$ meV between two dark exciton states. The low energy state being strictly dipole forbidden (perfectly dark) at Bz=0 while the upper state is partially coupled to light with z polarization ("grey" exciton). The first determination of the dark neutral exciton lifetime ${\tau }_D$ in a transition metal dichalcogenide monolayer is obtained by time-resolved photoluminescence. We measure ${\tau }_D\sim 110\pm 10$ ps for the grey exciton state, i.e. two orders of magnitude longer than the radiative lifetime of the bright neutral exciton at T=12 K.

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Cited by in corpus (91)

• Charge-tuneable biexciton complexes in monolayer WSe${}_2$
• Revealing the Biexciton and Trion-exciton Complexes in BN Encapsulated WSe2
• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• Brightened spin-triplet interlayer excitons and optical selection rules in van der Waals heterobilayers
• Measurement of the Spin-Forbidden Dark Excitons in MoS2 and MoSe2 monolayers
• Coulomb-bound four- and five-particle valleytronic states in an atomically-thin semiconductor
• Electroluminescence from multi-particle exciton complexes in transition metal dichalcogenide semiconductors
• Emerging Photoluminescence from the Dark-Exciton Phonon Replica in Monolayer WSe2
• Exciton diffusion in WSe2 monolayers embedded in a van der Waals heterostructure
• Gate tunable dark trions in monolayer WSe${}_2$
• Exciton g-factors of van der Waals heterostructures from first principles calculations
• Filtering the photoluminescence spectra of atomically thin semiconductors with graphene
• Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon
• Out-of-plane orientation of luminescent excitons in atomically thin indium selenide flakes
• Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WSe2
• Direct Observation of Gate Tunable Dark Trions in Monolayer WSe2
• Guide to optical spectroscopy of layered semiconductors
• Long valley lifetime of dark excitons in single-layer WSe2
• Energy spectrum of two-dimensional excitons in a non-uniform dielectric medium
• Exciton g-factors in monolayer and bilayer WSe${}_2$ from experiment and theory
• Probing and manipulating valley coherence of dark excitons in monolayer WSe${}_2$
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Probing Many-Body Interactions in Monolayer Transition-Metal Dichalcogenides
• Strain control of hybridization between dark and localized excitons in a 2D semiconductor
• Probing dark exciton navigation through a local strain landscape in a WSe${}_2$ monolayer
• Nonclassical Exciton Diffusion in Monolayer WSe2
• Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum
• Mapping of the dark exciton landscape in transition metal dichalcogenides
• Dark trions govern the temperature-dependent optical absorption and emission of doped atomically thin semiconductors
• Optical Selection Rule of Excitons in Gapped Chiral Fermion Systems
• Intrinsic Donor-Bound Excitons in Ultraclean Monolayer Semiconductors
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Distinctive signatures of the spin- and momentum-forbidden dark exciton states in the photo-luminescences of strained WSe${}_2$ monolayers under thermalization
• Valley relaxation of resident electrons and holes in a monolayer semiconductor: Dependence on carrier density and the role of substrate-induced disorder
• Rydberg series of dark excitons and the conduction band spin-orbit splitting in monolayer WSe${}_2$
• Unveiling valley lifetimes of free charge carriers in monolayer WSe${}_2$
• Strain-dependent exciton diffusion in transition metal dichalcogenides
• Exciton valley depolarization in monolayer transition-metal dichalcogenides
• Neutral and charged dark excitons in monolayer WS${}_2$
• Excitonic States in Semiconducting Two-dimensional Perovskites
• Exciton spectroscopy and diffusion in MoSe2-WSe2 lateral heterostructures encapsulated in hexagonal boron nitride
• Radiative lifetime of localized excitons in transition metal dichalcogenides
• Brightening of spin- and momentum-dark excitons in transition metal dichalcogenides
• Non equilibrium anisotropic excitons in atomically thin ReS${}_2$
• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• Symmetry and Control of Spin-Scattering Processes in Two-Dimensional Transition Metal Dichalcogenides
• Excitonic Complexes and Emerging Interlayer Electron-Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4
• Breakdown of Raman Selection Rules By Fröhlich Interaction in Few-Layer WS${}_2$
• Signatures of electric field and layer separation effects on the spin-valley physics of MoSe${}_2$/WSe${}_2$ heterobilayers: from energy bands to dipolar excitons
• Up- and Down-Conversion between Intra- and Inter-Valley Excitons in Waveguide Coupled Monolayer WSe2
• Interplay of Excitonic Complexes in $p$-Doped WSe${}_2$ Monolayers
• Lattice reconstruction in MoSe${}_2$-WSe${}_2$ heterobilayers synthesized by chemical vapor deposition
• Controlling valley splitting and Polarization of dark- and bi-excitons in monolayer WS${}_2$ by a tilted magnetic field
• Optical properties of exciton in two-dimensional transition metal dichalcogenide nanobubbles
• Probing biexciton in monolayer WS${}_2$ through controlled many-body interaction
• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
• Elastomeric waveguide on-chip coupling of an encapsulated MoS${}_2$ monolayer
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe${}_2$ monolayer
• Anisotropic complex refractive indices of atomically thin materials: determination of the optical constants of few-layer black phosphorus
• Trion-trion annihilation in monolayer WS${}_2$
• Intervalley electron-hole exchange interaction and impurity-assisted recombination of indirect excitons in WS${}_2$ and WSe${}_2$ monolayers
• The impact of valley profile on the mobility and Kerr rotation of transition metal dichalcogenides
• Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
• Interplay of energy and charge transfer in WSe2/CrSBr heterostructures
• Magnetically tunable exciton valley coherence in monolayer WS${}_2$ mediated by the electron-hole exchange and exciton-phonon interactions
• Electron energy-loss spectrum and exciton band structure of ${\mathrm{WSe}}_2$ monolayer studied by ab initio Bethe-Salpeter equation calculations
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• Valley-mediated singlet- and triplet-polaron interactions and quantum dynamics in a doped WSe${}_2$ monolayer
• Formation of dark excitons in monolayer transition metal dichalcogenides by a vortex beam: optical selection rules
• Two dimensional semiconductors: optical and electronic properties
• Photoluminescence kinetics of dark and bright excitons in atomically thin MoS${}_2$
• Engineering Purcell factor anisotropy for dark and bright excitons in two dimensional semiconductors
• Brightening odd-parity excitons in transition-metal dichalcogenides: Rashba spin-orbit interaction, skyrmions, and cavity polaritons
• Nonexponential photoluminescence dynamics in an inhomogeneous ensemble of excitons in WSe${}_2$ monolayers
• Multidimensional sensing of proximity magnetic fields via intrinsic activation of dark excitons in WSe${}_2$/CrCl${}_3$ heterostructure
• Band-spin-valley coupled exciton physics in antiferromagnetic MnPS${}_3$
• Signatures of valley drift in the diversified band dispersions of bright, gray, and dark excitons in MoS2 monolayers under uni-axial strains
• Electrical Control of Excitons in Bare-MoSe2 and MoSe2/NbSe2 Heterostructure
• Valley-dependent emission patterns enabled by plasmonic nanoantennas
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Strong Exciton-Photon Coupling in Large Area MoSe${}_2$ and WSe${}_2$ Heterostructures Fabricated from Two-Dimensional Materials Grown by Chemical Vapor Deposition
• Controllable fusion of electromagnetic bosons in two-dimensional semiconductors
• Long-lived populations of momentum- and spin-indirect excitons in monolayer WSe${}_2$
• Variational and field-theoretical approach to exciton-exciton interactions and biexcitons in semiconductors
• Spectral asymmetry of phonon sideband luminescence in monolayer and bilayer WSe2
• Uniform Narrow Excitonic Spectrum in Large-Area Suspended WSe2 Monolayers
• Ellipticity-Controlled Bright-Dark Coherence Transition in Monolayer WSe2
• Efficient valley polarization of charged excitons and resident carriers in MoS2 monolayers by optical pumping
• Optical Measurement of Pseudo-Spin Texture of the Exciton Fine-Structure in Monolayer WSe2 within the Light Cone
• Correlated phases of moat-band excitons in two dimensions