Revealing the Biexciton and Trion-exciton Complexes in BN Encapsulated WSe2

Abstract

Strong Coulomb interactions in single-layer transition metal dichalcogenides (TMDs) result in the emergence of strongly bound excitons, trions and biexcitons. These excitonic complexes possess the valley degree of freedom, which can be exploited for quantum optoelectronics. However, in contrast to the good understanding of the exciton and trion properties, the binding energy of the biexciton remains elusive, with theoretical calculations and experimental studies reporting discrepant results. In this work, we resolve the conflict by employing low-temperature photoluminescence spectroscopy to identify the biexciton state in BN encapsulated single-layer WSe2. The biexciton state only exists in charge neutral WSe2, which is realized through the control of efficient electrostatic gating. In the lightly electron-doped WSe2, one free electron binds to a biexciton and forms the trion-exciton complex. Improved understanding of the biexciton and trion-exciton complexes paves the way for exploiting the many-body physics in TMDs for novel optoelectronics applications.

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Cited by in corpus (77)

• Correlated Insulating States at Fractional Fillings of the WS2/WSe2 Moiré Lattice
• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• Electroluminescence from multi-particle exciton complexes in transition metal dichalcogenide semiconductors
• Emerging Photoluminescence from the Dark-Exciton Phonon Replica in Monolayer WSe2
• Gate tunable dark trions in monolayer WSe${}_2$
• Raman spectrum of Janus transition metal dichalcogenide monolayers WSSe and MoSSe
• Resolving spin, valley, and moiré quasi-angular momentum of interlayer excitons in WSe2/WS2 heterostructures
• Filtering the photoluminescence spectra of atomically thin semiconductors with graphene
• 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
• Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure
• 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
• The valley Zeeman effect in inter- and intra-valley trions in monolayer WSe${}_2$
• Probing and manipulating valley coherence of dark excitons in monolayer WSe${}_2$
• Electron-exciton interactions in the exciton-polaron problem
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Probing Many-Body Interactions in Monolayer Transition-Metal Dichalcogenides
• Luminescent emission of excited Rydberg excitons from monolayer WSe2
• Stark shift of excitons and trions in two-dimensional materials
• Hexcitons and oxcitons in monolayer WSe${}_2$
• Excitonic complexes in $n$-doped WS${}_2$ monolayer
• Ground and Excited Exciton Polarons in Monolayer MoSe2
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Relaxation and darkening of excitonic complexes in electrostatically-doped monolayer semiconductors: Roles of exciton-electron and trion-electron interactions
• Autoionization and dressing of excited excitons by free carriers in monolayer WSe2
• Virtual trions in the photoluminescence of monolayer transition-metal dichalcogenides
• Neutral and charged dark excitons in monolayer WS${}_2$
• Few-body systems in condensed matter physics
• Stacking-dependent exciton multiplicity in WSe${}_2$ bilayers
• Theoretical methods for excitonic physics in two-dimensional materials
• Strongly-bound excitons and trions in anisotropic 2D semiconductors
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Tuning the Optical Properties of an MoSe${}_2$ Monolayer Using Nanoscale Plasmonic Antennas
• Excitonic Complexes and Emerging Interlayer Electron-Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4
• Direct Measurement of Biexcitons in Monolayer WS2
• 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
• Direct Observation of Intravalley Phonon Scattering of 2s Excitons in MoSe${}_2$ and WSe${}_2$ Monolayers
• Controlling valley splitting and Polarization of dark- and bi-excitons in monolayer WS${}_2$ by a tilted magnetic field
• Radially polarized light beams from spin-forbidden dark excitons and trions in monolayer WSe${}_2$
• Excitation-Dependent High-Lying Excitonic Exchange via Interlayer Energy Transfer from Lower-to-Higher Bandgap 2D Material
• Excited-State Trions in Two Dimensional Materials
• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
• Charge Density Wave Activated Excitons in TiSe${}_2$-MoSe${}_2$ Heterostructures
• Tuning exciton complexes in twisted bilayer WSe2 at intermediate misorientation
• The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe${}_2$ monolayer
• Effects of dynamical dielectric screening on the excitonic spectrum of monolayer semiconductors
• Intervalley electron-hole exchange interaction and impurity-assisted recombination of indirect excitons in WS${}_2$ and WSe${}_2$ monolayers
• Dark-state impact on the exciton recombination of WS2 monolayers as revealed by multi-time-scale pump-and-probe spectroscopy
• Excitons and trions in WSSe monolayers
• Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
• Electrically Controlled Interfacial Charge Transfer Induced Excitons in MoSe2-WSe2 Lateral Heterostructure
• Charge-carrier complexes in monolayer semiconductors
• Trion formation resolves observed peak shifts in the optical spectra of transition metal dichalcogenides
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• Curvature-enhanced localised emission from dark states in wrinkled monolayer WSe2 at room temperature
• Dipolar polaritons squeezed at unitarity
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• Pairing of electro-magnetic bosons under spin-orbit coupling
• Spin-orbit coupled depairing of a dipolar biexciton superfluid
• Spatial filtering of interlayer exciton ground state in WSe2/MoS2 heterobilayer
• Multidimensional sensing of proximity magnetic fields via intrinsic activation of dark excitons in WSe${}_2$/CrCl${}_3$ heterostructure
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
• $WS{e}_2$ Monolayers Grown by Molecular Beam Epitaxy on hBN
• Robustness of momentum-indirect interlayer excitons in MoS2/WSe2 heterostructure against charge carrier doping
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Controllable fusion of electromagnetic bosons in two-dimensional semiconductors
• Excitonic-trion population in two-dimensional halide perovskites
• Optical response of WSe${}_2$-based vertical tunneling junction
• Interfacial Polarons Driven by Charge Transfer In WSe2/Cuprate Superconductor Systems
• Layered semiconductors integrated with polyimide thin films for high-quality valleytronic and quantum-photonic systems
• Fermion quartets on the square lattice
• Supermoiré-trapped quadrupolar exciton
• Gate-modulated reflectance spectroscopy for detecting excitonic species in two-dimensional semiconductors