Charge-tuneable biexciton complexes in monolayer WSe${}_2$

Abstract

Multi-exciton states such as biexcitons, albeit theoretically predicted, have remained challenging to identify in atomically thin transition metal dichalcogenides so far. Here, we use excitation-power, electric-field and magnetic-field dependence of photoluminescence to report direct experimental evidence of two biexciton complexes in monolayer tungsten diselenide: the neutral and the negatively charged biexciton. We demonstrate bias-controlled switching between these two states, we determine their internal structure and we resolve a fine-structure splitting of 2.5 meV for the neutral biexciton. Our results unveil multi-particle exciton complexes in transition metal dichalcogenides and offer direct routes to their deterministic control in many-body quantum phenomena.

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Cited by in corpus (96)

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• Filtering the photoluminescence spectra of atomically thin semiconductors with graphene
• Optical properties of charged excitons in two-dimensional semiconductors
• Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon
• Correlated insulator of excitons in WSe2/WS2 moiré superlattices
• Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WSe2
• Discrete Interactions between a few Interlayer Excitons Trapped at a MoSe${}_2$-WSe${}_2$ Heterointerface
• Direct Observation of Gate Tunable Dark Trions in Monolayer WSe2
• Near-unity light absorption in a monolayer WS2 van der Waals heterostructure cavity
• Guide to optical spectroscopy of layered semiconductors
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• 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
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• Probing and manipulating valley coherence of dark excitons in monolayer WSe${}_2$
• Collective Excitations in 2D Materials
• Room-Temperature Electron-Hole Liquid in Monolayer MoS2
• Identifying defect-related quantum emitters 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
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• Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum
• Opportunities in Electrically Tunable 2D Materials Beyond Graphene: Recent Progress and Future Outlook
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• Exciton-polaron interactions in monolayer WS${}_2$
• Photoluminescence imaging of single photon emitters within nanoscale strain profiles in monolayer WSe${}_2$
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• Hexcitons and oxcitons in monolayer WSe${}_2$
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• Intrinsic Donor-Bound Excitons in Ultraclean Monolayer Semiconductors
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• Localized Excitons in NbSe${}_2$-MoSe${}_2$ Heterostructures
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• Low-loss integrated nanophotonic circuits with layered semiconductor materials
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• Few-body systems in condensed matter physics
• Stacking-dependent exciton multiplicity in WSe${}_2$ bilayers
• Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$
• Manipulation of exciton and trion quasiparticles in monolayer WS2 via charge transfer
• Exploring the structural and optoelectronic properties of natural insulating phlogopite in van der Waals heterostructures
• Anomalous Stark Shift of Excitonic Complexes in Monolayer Semiconductor
• Many-body exciton and inter-valley correlations in heavily electron-doped WSe${}_2$ monolayers
• Breakdown of the static dielectric screening approximation of Coulomb interactions in atomically thin semiconductors
• Tuning the Optical Properties of an MoSe${}_2$ Monolayer Using Nanoscale Plasmonic Antennas
• Unveiling the optical emission channels of monolayer semiconductors coupled to silicon nanoantennas
• Up- and Down-Conversion between Intra- and Inter-Valley Excitons in Waveguide Coupled Monolayer WSe2
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
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• Direct Observation of Intravalley Phonon Scattering of 2s Excitons in MoSe${}_2$ and WSe${}_2$ Monolayers
• Nonlocal Exciton-Photon Interactions in Hybrid High-Q Beam Nanocavities with Encapsulated MoS${}_2$ Monolayers
• Radially polarized light beams from spin-forbidden dark excitons and trions in monolayer WSe${}_2$
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• Excited-State Trions in Two Dimensional Materials
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• Probing excitons with time-resolved momentum microscopy
• Many-Body Effect of Mesoscopic Localized States in MoS${}_2$ Monolayer
• Local photodoping in monolayer MoS2
• Charge-carrier complexes in monolayer semiconductors
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• How the dynamic of photo-induced gate screening complicates the investigation of valley physics in 2D materials