Tightly bound excitons in monolayer WSe2

Abstract

Exciton binding energy and excited states in monolayers of tungsten diselenide (WSe2) are investigated using the combined linear absorption and two-photon photoluminescence excitation spectroscopy. The exciton binding energy is determined to be 0.37eV, which is about an order of magnitude larger than that in III-V semiconductor quantum wells and renders the exciton excited states observable even at room temperature. The exciton excitation spectrum with both experimentally determined one- and two-photon active states is distinct from the simple two-dimensional (2D) hydrogenic model. This result reveals significantly reduced and nonlocal dielectric screening of Coulomb interactions in 2D semiconductors. The observed large exciton binding energy will also have a significant impact on next-generation photonics and optoelectronics applications based on 2D atomic crystals.

arXiv comment19 pages, 4 figures, to appear in PRL

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Cited by in corpus (389)

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• Magneto-reflection spectroscopy of monolayer transition-metal dichalcogenide semiconductors in pulsed magnetic fields
• Valley-contrasting interband transitions and excitons in symmetrically biased dice model
• Multi-component plasmons in monolayer MoS${}_2$ with circularly polarized optical pumping
• Imaging Seebeck drift of excitons and trions in MoSe2 monolayers
• Probing spin dynamics of 2D excitons with twisted light
• Dark exciton energy splitting in monolayer WSe2: insights from time-dependent density-functional theory
• Probing Noncentrosymmetric 2D Materials by Fourier Space Second Harmonic Imaging
• Efficient calculation of trion energies in monolayer transition metal dichalcogenides
• Thermal effect on magnetoexciton energy spectra in monolayer transition metal dichalcogenides
• Modelling excitonic Mott transitions in two-dimensional semiconductors
• Molecule signatures in photoluminescence spectra of transition metal dichalcogenides
• Anomalous energy shift of laterally confined two-dimensional excitons
• Interplay of trapped species and absence of electron capture in Moiré heterobilayers
• Phonon-mediated exciton relaxation in two-dimensional semiconductors: selection rules and relaxation pathways
• Valley-selective energy transfer between quantum dots in atomically thin semiconductors
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Brightening odd-parity excitons in transition-metal dichalcogenides: Rashba spin-orbit interaction, skyrmions, and cavity polaritons
• Laser-field detuning assisted optimization of exciton valley dynamics in monolayer WSe${}_2$: Geometric quantum speed limit
• Tightly-bound and room-temperature-stable excitons in van der Waals degenerate-semiconductor Bi4O4SeCl2 with high charge-carrier density
• Onset of exciton-exciton annihilation in single layer black phosphorus
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• Strong Cavity-Pseudospin Coupling in Monolayer Transition Metal Dichalcogenides: Spontaneous Spin-Oscillations and Magnetometry
• Direct observation of two-dimensional small polarons at correlated oxide interface
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Signatures of defect-localized charged excitons in the photoluminescence of monolayer molybdenum disulfide
• Phase diagram of electron-hole liquid in monolayer heterostructures based on transition metal dichalcogenides
• Origin of interlayer exciton-phonon coupling in 2D heterostructures
• Strong Correlation Driven Quadrupolar to Dipolar Exciton Transitions in a Trilayer Moiré Superlattice
• Landau-level composition of bound exciton states in magnetic field
• Phonon Assisted Exciton Processes in Two-Dimensional Tungsten Monocarbide
• Driven Dipolariton Transistors in Y-shaped Channels
• Electronic structure of 2D van der Waals crystals and heterostructures investigated by spatially- and angle-resolved photoemission
• Exchange-enhanced spin-orbit splitting and its density dependence for electrons in monolayer transition metal dichalcogenides
• Analytical exciton energies in monolayer transition-metal dichalcogenides
• Exciton spectrum in two-dimensional transition metal dichalcogenides: The role of Diracness
• Directing Monolayer Tungsten Disulfide Photoluminescence using a Bent Plasmonic Nanowire on a Mirror Cavity
• Localized polariton states in a photonic crystal intercalated by a transition metal dichalcogenide monolayer
• Dielectric permittivity tensor dynamics of in-plane hyperbolic van der Waals MoOCl2 and emergent chiral photonic applications
• Retrieval of fundamental material parameters of monolayer transition metal dichalcogenides from experimental exciton energies: An analytical approach
• Bound states in the continuum in cuprous oxide quantum wells
• Renormalization of the optical band gap through an effective Thirring interaction for massive Dirac-like electrons
• Quasi-equilibrium polariton condensates in the non-linear regime and beyond
• Strong Exciton-Photon Coupling in Large Area MoSe${}_2$ and WSe${}_2$ Heterostructures Fabricated from Two-Dimensional Materials Grown by Chemical Vapor Deposition
• Monolayer Excitonic Laser
• Room-temperature Strong Coupling of Au Nanorod-WSe2 Heterostructures
• Unconventional bright ground-state excitons in monolayer TiI${}_2$ from first-principles calculations
• Brightening interlayer excitons by electric-field-driven hole transfer in bilayer WSe2
• Interaction effects on electronic Floquet spectra: Excitonic effects
• Semiclassical approach for excitonic spectrum of Coulomb coupling between two Dirac particles
• Ferroelectric driven exciton and trion modulation in monolayer MoSe2 and WSe2
• Nonlinear optics in the electron-hole continuum in 2D semiconductors: two-photon transition, second harmonic generation and valley current injection
• Non-Linear behavior of Raman Linewidth of 1-3 Layer WSe2
• Hyperfine interaction in atomically thin transition metal dichalcogenides
• Highly Efficient Carrier Multiplication in van der Waals layered Materials
• Suppression and amplification of phonon sidebands in transition metal dichalcogenides by optical feedback
• Gate-modulated reflectance spectroscopy for detecting excitonic species in two-dimensional semiconductors