Neutral and charged dark excitons in monolayer WS${}_2$

Abstract

Low temperature and polarization resolved magneto-photoluminescence experiments are used to investigate the properties of dark excitons and dark trions in a monolayer of WS${}_2$ encapsulated in hexagonal BN (hBN). We find that this system is an $n$-type doped semiconductor and that dark trions dominate the emission spectrum. In line with previous studies on WSe${}_2$, we identify the Coulomb exchange interaction coupled neutral dark and grey excitons through their polarization properties, while an analogous effect is not observed for dark trions. Applying the magnetic field in both perpendicular and parallel configurations with respect to the monolayer plane, we determine the g-factor of dark trions to be $g\sim$-8.6. Their decay rate is close to 0.5 ns, more than 2 orders of magnitude longer than that of bright excitons.

arXiv comment6 pages, 6 figures, supplemental material

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• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
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• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• 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
• Probing biexciton in monolayer WS${}_2$ through controlled many-body interaction
• The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe${}_2$ monolayer
• Excitons and trions in WSSe monolayers
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• 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
• Multidimensional sensing of proximity magnetic fields via intrinsic activation of dark excitons in WSe${}_2$/CrCl${}_3$ heterostructure
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Optical response of WSe${}_2$-based vertical tunneling junction
• Gate-modulated reflectance spectroscopy for detecting excitonic species in two-dimensional semiconductors
• Unconventional bright ground-state excitons in monolayer TiI${}_2$ from first-principles calculations