Hexcitons and oxcitons in monolayer WSe${}_2$

Abstract

In the archetypal monolayer semiconductor WSe${}_2$, the distinct ordering of spin-polarized valleys (low-energy pockets) in the conduction band allows for studies of not only simple neutral excitons and charged excitons (i.e., trions), but also more complex many-body states that are predicted at higher electron densities. We discuss magneto-optical measurements of electron-rich WSe${}_2$ monolayers, and interpret the spectral lines that emerge at high electron doping as optical transitions of 6-body exciton states ("hexcitons") and 8-body exciton states ("oxcitons"). These many-body states emerge when a photoexcited electron-hole pair interacts simultaneously with multiple Fermi seas, each having distinguishable spin and valley quantum numbers. In addition, we identify the energies of primary and satellite optical transitions of hexcitons in the photoluminescence spectrum.

References in corpus (13)

• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• Probing the spin-polarized electronic band structure in monolayer transition metal dichalcogenides by optical spectroscopy
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• Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer
• A Many-Body Theory of the Optical Conductivity of Excitons and Trions in Two-Dimensional Materials
• Relaxation and darkening of excitonic complexes in electrostatically-doped monolayer semiconductors: Roles of exciton-electron and trion-electron interactions
• Rydberg series of dark excitons and the conduction band spin-orbit splitting in monolayer WSe${}_2$
• Landau-quantized excitonic absorption and luminescence in a monolayer valley semiconductor
• Many-body exciton and inter-valley correlations in heavily electron-doped WSe${}_2$ monolayers
• Composite excitonic states in doped semiconductors

Cited by in corpus (21)

• Exciton optics, dynamics and transport in atomically thin semiconductors
• Breakdown of the static dielectric screening approximation of Coulomb interactions in atomically thin semiconductors
• Twist angle dependent interlayer transfer of valley polarization from excitons to free charge carriers in WSe${}_2$/MoSe${}_2$ heterobilayers
• Composite excitonic states in doped semiconductors
• Quartet Superfluid in Two-dimensional Mass-imbalanced Fermi Mixtures
• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
• Excitons and trions in monolayer semiconductors with correlated electrons
• Polaron spectroscopy of interacting Fermi systems: insights from exact diagonalization
• Engineering robust strain transmission in van der Waals heterostructure devices
• Effects of dynamical dielectric screening on the excitonic spectrum of monolayer semiconductors
• Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
• Charge-carrier complexes in monolayer semiconductors
• Valley-mediated singlet- and triplet-polaron interactions and quantum dynamics in a doped WSe${}_2$ monolayer
• Longitudinal-transverse splitting and fine structure of Fermi polarons in two-dimensional semiconductors
• Ten-valley excitonic complexes in charge-tunable monolayer WSe${}_2$
• Competing few-body correlations in ultracold Fermi polarons
• Excitons in periodic potentials
• Component exchange theory of trions
• Landau-level composition of bound exciton states in magnetic field
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
• Terahertz radiation induced attractive-repulsive Fermi polaron conversion in transition metal dichalcogenide monolayers