Marrying excitons and plasmons in monolayer transition-metal dichalcogenides

Abstract

Just as photons are the quanta of light, plasmons are the quanta of orchestrated charge-density oscillations in conducting media. Plasmon phenomena in normal metals, superconductors and doped semiconductors are often driven by long-wavelength Coulomb interactions. However, in crystals whose Fermi surface is comprised of disconnected pockets in the Brillouin zone, collective electron excitations can also attain a shortwave component when electrons transition between these pockets. Here, we show that the band structure of monolayer transition-metal dichalcogenides gives rise to an intriguing mechanism through which shortwave plasmons are paired up with excitons. The coupling elucidates the origin for the optical side band that is observed repeatedly in monolayers of WSe${}_2$ and WS${}_2$ but not understood. The theory makes it clear why exciton-plasmon coupling has the right conditions to manifest itself distinctly only in the optical spectra of electron-doped tungsten-based monolayers.

References in corpus (15)

• The Valley Hall Effect in MoS2 Transistors
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• Exciton band structure of monolayer MoS2
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• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
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• Trion and Biexciton in Monolayer Transition Metal Dichalcogenides
• Auger recombination of dark excitons in $\mathrm{W}{\mathrm{S}}_2$ and $\mathrm{WS}{\mathrm{e}}_2$ monolayers
• Spin-dependent optical properties in strained silicon and germanium

Cited by in corpus (36)

• The Coulomb interaction in monolayer transition-metal dichalcogenides
• Magnetic Proximity Effects in Transition-Metal Dichalcogenides: Converting Excitons
• Biexciton fine structure in monolayer transition metal dichalcogenides
• Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2
• Optospintronics in graphene via proximity coupling
• Electron-exciton interactions in the exciton-polaron problem
• Impact of strain on the excitonic linewidth in transition metal dichalcogenides
• Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum
• Strongly interaction-enhanced valley magnetic response in monolayer WSe2
• Efficient phonon cascades in hot photoluminescence of WSe${}_2$ monolayers
• Hexcitons and oxcitons in monolayer WSe${}_2$
• Valley relaxation of resident electrons and holes in a monolayer semiconductor: Dependence on carrier density and the role of substrate-induced disorder
• Virtual trions in the photoluminescence of monolayer transition-metal dichalcogenides
• Exciton valley depolarization in monolayer transition-metal dichalcogenides
• Optically Probing Tunable Band Topology in Atomic Monolayers
• The dynamically screened ladder approximation: Simultaneous treatment of strong electronic correlations and dynamical screening out of equilibrium
• Radiative lifetime of localized excitons in transition metal dichalcogenides
• Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$
• Frequency-dependent substrate screening of excitons in atomically thin transition metal dichalcogenide semiconductors
• Many-body exciton and inter-valley correlations in heavily electron-doped WSe${}_2$ monolayers
• Excitonic Complexes and Emerging Interlayer Electron-Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4
• Ab initio study of electromagnatic modes in two-dimensional semiconductors: Application to doped phosphorene
• Composite excitonic states in doped semiconductors
• Excitonic theory of doping-dependent optical response in atomically thin semiconductors
• Charge Density Wave Activated Excitons in TiSe${}_2$-MoSe${}_2$ Heterostructures
• Effects of dynamical dielectric screening on the excitonic spectrum of monolayer semiconductors
• Trion-trion annihilation in monolayer WS${}_2$
• Rotons in Optical Excitation Spectra of Monolayer Semiconductors
• Intrinsic edge excitons in two-dimensional MoS${}_2$
• Symmetry Classification for Alternating Excitons in Two-Dimensional Altermagnets
• Excitons in periodic potentials
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• Tunable resonant s-p mixing of excitons in van der Waals heterostructures
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
• Optical response of WSe${}_2$-based vertical tunneling junction
• Fine structure of negatively charged and neutral excitons in monolayer MoS${}_2$