Optically discriminating carrier-induced quasiparticle band gap and exciton energy renormalization in monolayer MoS2

Abstract

Optoelectronic excitations in monolayer MoS2 manifest from a hierarchy of electrically tunable, Coulombic free-carrier and excitonic many-body phenomena. Investigating the fundamental interactions underpinning these phenomena - critical to both many-body physics exploration and device applications - presents challenges, however, due to a complex balance of competing optoelectronic effects and interdependent properties. Here, optical detection of bound- and free-carrier photoexcitations is used to directly quantify carrier-induced changes of the quasiparticle band gap and exciton binding energies. The results explicitly disentangle the competing effects and highlight longstanding theoretical predictions of large carrier-induced band gap and exciton renormalization in 2D semiconductors.

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• Nonlinear twistoptics at symmetry-broken interfaces
• How Substitutional Point Defects in Two-Dimensional WS${}_2$ Induce Charge Localization, Spin-Orbit Splitting, and Strain
• Direct Determination of Band Gap Renormalization in Photo-Excited Monolayer MoS2
• The ultrafast onset of exciton formation in 2D semiconductors
• Optically discriminating carrier-induced quasiparticle band gap and exciton energy renormalization in monolayer MoS2
• Direct measurement of key exciton properties: energy, dynamics and spatial distribution of the wave function
• Substrate screening effects on the quasiparticle band gap and defect charge transition levels in MoS${}_2$
• Dielectric dependent hybrid functionals for heterogeneous materials
• Fundamental Principles for Calculating Charged Defect Ionization Energies in Ultrathin Two-Dimensional Materials
• Gate tunable optical absorption and band structure of twisted bilayer graphene
• Visualizing Orbital Content of Electronic Bands in Anisotropic 2D Semiconducting ReSe${}_2$
• Many-body theory of optical absorption in doped two-dimensional semiconductors
• Time-dependent screening explains the ultrafast excitonic signal rise in 2D semiconductors
• Quasiparticle band-gap renormalization in doped monolayer MoS${}_2$
• Ultra Localized Optoelectronic Properties of Nanobubbles in 2D Semiconductors
• Charged exciton kinetics in monolayer MoSe${}_2$ near ferroelectric domain walls in periodically poled LiNbO${}_3$
• Phonon-assisted processes in the ultraviolet transient optical response of graphene
• Direct Nano-Imaging of Light-Matter Interactions in Nanoscale Excitonic Emitters
• Theory of coherent phonons coupled to excitons
• Rotons in Optical Excitation Spectra of Monolayer Semiconductors
• Ultrafast creation and melting of nonequilibrium excitonic condensates in bulk WSe${}_2$
• Many-body exchange-correlation effects in MoS${}_2$ monolayer: The key role of nonlocal dielectric screening
• Retrieval of fundamental material parameters of monolayer transition metal dichalcogenides from experimental exciton energies: An analytical approach
• Contactless photo-induced carrier density control in nanocrystal MoS2 hybrids
• Exciton self-trapping causes picoseconds recombination in metal-organic chalcogenides hybrid quantum wells