Excitonic complexes in $n$-doped WS${}_2$ monolayer

Abstract

We investigate the origin of emission lines apparent in the low-temperature photoluminescence spectra of $n$-doped WS${}_2$ monolayer embedded in hexagonal BN layers using external magnetic fields and first-principles calculations. Apart from the neutral A exciton line, all observed emission lines are related to the negatively charged excitons. Consequently, we identify emissions due to both the bright (singlet and triplet) and dark (spin- and momentum-forbidden) negative trions as well as the phonon replicas of the latter optically-inactive complexes. The semi-dark trions and negative biexcitons are distinguished. Based on their experimentally extracted and theoretically calculated $g$-factors, we identify three distinct families of emissions due to exciton complexes in WS${}_2$: bright, intravalley and intervalley dark. The $g$-factors of the spin-split subbands in both the conduction and valence bands are also determined.

Manuscript: 7 pages, 5 figures; SI: 5 pages, 3 figures

References in corpus (33)

• Excitons in atomically thin transition metal dichalcogenides
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Magnetic brightening and control of dark excitons in monolayer WSe2
• Exciton Diamagnetic Shifts and Valley Zeeman Effects in Monolayer WS${}_2$ and MoS${}_2$ to 65 Tesla
• Directly visualizing the momentum forbidden dark excitons and their dynamics in atomically thin semiconductors
• Charge-tuneable biexciton complexes in monolayer WSe${}_2$
• Revealing the Biexciton and Trion-exciton Complexes in BN Encapsulated WSe2
• Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides
• Optical properties of atomically thin transition metal dichalcogenides: Observations and puzzles
• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• 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
• Optical response of monolayer, few-layer and bulk tungsten disulfide
• Gate tunable dark trions in monolayer WSe${}_2$
• Exciton g-factors of van der Waals heterostructures from first principles calculations
• Long-Lived Valley Polarization of Intra-Valley Trions in Monolayer WSe2
• Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon
• Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WSe2
• Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2
• Spin-flip processes and radiative decay of dark intravalley excitons in transition metal dichalcogenide monolayers
• Direct Observation of Gate Tunable Dark Trions in Monolayer WSe2
• Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe${}_2$
• Energy spectrum of two-dimensional excitons in a non-uniform dielectric medium
• Singlet and triplet trions in WS${}_2$ monolayer encapsulated in hexagonal boron nitride
• Probing and manipulating valley coherence of dark excitons in monolayer WSe${}_2$
• Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer
• Dark trions and biexcitons in WS2 and WSe2 made bright by e-e scattering
• Auger recombination of dark excitons in $\mathrm{W}{\mathrm{S}}_2$ and $\mathrm{WS}{\mathrm{e}}_2$ monolayers
• Neutral and charged dark excitons in monolayer WS${}_2$
• Valley polarization of singlet and triplet trions in WS${}_2$ monolayer in magnetic fields

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• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
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• The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe${}_2$ monolayer
• Excitons and trions in WSSe monolayers
• Trion-trion annihilation in monolayer WS${}_2$
• Analogy and dissimilarity of excitons in monolayer and bilayer of MoSe${}_2$
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• Electrostatic control of the trion fine structure in transition metal dichalcogenide monolayers
• 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
• Emergence of new optical resonances in single-layer transition metal dichalcogenides with atomic-size phase patterns