Measurement of the Spin-Forbidden Dark Excitons in MoS2 and MoSe2 monolayers

Abstract

Excitons with binding energies of a few hundreds of meV control the optical properties of transition metal dichalcogenide monolayers. Knowledge of the fine structure of these excitons is therefore essential to understand the optoelectronic properties of these 2D materials. Here we measure the exciton fine structure of MoS2 and MoSe2 monolayers encapsulated in boron nitride by magneto-photoluminescence spectroscopy in magnetic fields up to 30 T. The experiments performed in transverse magnetic field reveal a brightening of the spin-forbidden dark excitons in MoS2 monolayer: we find that the dark excitons appear at 14 meV below the bright ones. Measurements performed in tilted magnetic field provide a conceivable description of the neutral exciton fine structure. The experimental results are in agreement with a model taking into account the effect of the exchange interaction on both the bright and dark exciton states as well as the interaction with the magnetic field.

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• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
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• Optical dipole orientation of interlayer excitons in MoSe${}_2$-WSe${}_2$ heterostacks
• Brightening of spin- and momentum-dark excitons in transition metal dichalcogenides
• Exciton spectroscopy and diffusion in MoSe2-WSe2 lateral heterostructures encapsulated in hexagonal boron nitride
• Charge transfer and asymmetric coupling of MoSe${}_2$ valleys to the magnetic order of CrSBr
• Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$
• Exposing the trion's fine structure by controlling the carrier concentration in hBN-encapsulated MoS${}_2$
• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• Enhancement of Exciton Valley Polarization in Monolayer MoS2 Induced by Scattering
• Exciton-phonon interaction calls for a revision of the "exciton" concept
• Symmetry and Control of Spin-Scattering Processes in Two-Dimensional Transition Metal Dichalcogenides
• Brightening of a dark monolayer semiconductor via strong light-matter coupling in a cavity
• Unveiling the optical emission channels of monolayer semiconductors coupled to silicon nanoantennas
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Tunable magneto-optical properties in MoS${}_2$ via defect-induced exciton transitions
• Optical properties of exciton in two-dimensional transition metal dichalcogenide nanobubbles
• Excitation-Dependent High-Lying Excitonic Exchange via Interlayer Energy Transfer from Lower-to-Higher Bandgap 2D Material
• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
• Probing Dark Excitons in Monolayer MoS${}_2$ by NonLinear Two-Photon Spectroscopy
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• Charge Density Wave Activated Excitons in TiSe${}_2$-MoSe${}_2$ Heterostructures
• The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe${}_2$ monolayer
• Tuning exciton recombination rates in doped transition metaldichalcogenides
• Excitons and trions in WSSe monolayers
• Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
• Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
• Influence of resonant plasmonic nanoparticles on optically accessing the valley degree of freedom in 2D semiconductors
• Charge-carrier complexes in monolayer semiconductors
• Spin-valley relaxation dynamics of Landau-quantized electrons in MoSe${}_2$ monolayer
• Parallel Exploration of the Optoelectronic Properties of (Sb,Bi)(S,Se)(Br,I) Chalcohalides
• Valley-mediated singlet- and triplet-polaron interactions and quantum dynamics in a doped WSe${}_2$ monolayer
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• Coherent spin dynamics of excitons in strained monolayer semiconductors
• Electrical control of orbital and vibrational interlayer coupling in bi- and trilayer 2H-MoS${}_2$
• Thermal effect on magnetoexciton energy spectra in monolayer transition metal dichalcogenides
• Signature of electromagnetic quantum fluctuations in exciton physics
• Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS${}_2$
• Engineering Purcell factor anisotropy for dark and bright excitons in two dimensional semiconductors
• Exchange-enhanced spin-orbit splitting and its density dependence for electrons in monolayer transition metal dichalcogenides
• Hybrid dark excitons in monolayer ${MoS}_2$
• Band-spin-valley coupled exciton physics in antiferromagnetic MnPS${}_3$
• Effects of Reduced Interlayer Interactions on the K-point Excitons of MoS${}_2$ Nanoscrolls
• Signatures of valley drift in the diversified band dispersions of bright, gray, and dark excitons in MoS2 monolayers under uni-axial strains
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Intersubband electric dipole spin resonance in transition metal dichalcogenide heterobilayers
• Brightening dark excitons and trions in systems with a Mexican-hat energy dispersion: example of InSe
• Rydberg series of intralayer K-excitons in WSe${}_2$ multilayers
• Ellipticity-Controlled Bright-Dark Coherence Transition in Monolayer WSe2
• Efficient valley polarization of charged excitons and resident carriers in MoS2 monolayers by optical pumping
• Symmetries in zero and finite center-of-mass momenta excitons