Luminescent emission of excited Rydberg excitons from monolayer WSe2

Abstract

We report the experimental observation of radiative recombination from Rydberg excitons in a two-dimensional semiconductor, monolayer WSe2, encapsulated in hexagonal boron nitride. Excitonic emission up to the 4s excited state is directly observed in photoluminescence spectroscopy in an out-of-plane magnetic field up to 31 Tesla. We confirm the progressively larger exciton size for higher energy excited states through diamagnetic shift measurements. This also enables us to estimate the 1s exciton binding energy to be about 170 meV, which is significantly smaller than most previous reports. The Zeeman shift of the 1s to 3s states, from both luminescence and absorption measurements, exhibits a monotonic increase of g-factor, reflecting nontrivial magnetic-dipole-moment differences between ground and excited exciton states. This systematic evolution of magnetic dipole moments is theoretically explained from the spreading of the Rydberg states in momentum space.

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• Ab-initio studies of exciton $g$ factors: Monolayer transition metal dichalcogenides in magnetic fields
• Magneto-photoluminescence of exciton Rydberg states in monolayer WSe${}_2$
• Ground and Excited Exciton Polarons in Monolayer MoSe2
• Rydberg series of dark excitons and the conduction band spin-orbit splitting in monolayer WSe${}_2$
• Giant proximity exchange and valley splitting in transition metal dichalcogenide/$h\mathrm{BN}$/(Co, Ni) heterostructures
• Enhancement of Exciton Valley Polarization in Monolayer MoS2 Induced by Scattering
• In-Plane Electric Field Induced Orbital Hybridization of Excitonic States In Monolayer WSe2
• Signatures of sub-band excitons in few-layer black phosphorus
• Up- and Down-Conversion between Intra- and Inter-Valley Excitons in Waveguide Coupled Monolayer WSe2
• Magnetoexcitons in transition-metal dichalcogenides monolayers, bilayers, and van der Waals heterostructures
• Exciton spectrum in atomically thin monolayers: The role of hBN encapsulation
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• Excited-State Trions in Two Dimensional Materials
• Effects of parallel electric and magnetic fields on Rydberg excitons in buckled two-dimensional materials
• Analogy and dissimilarity of excitons in monolayer and bilayer of MoSe${}_2$
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Insights into hyperbolic phonon polaritons in hBN using Raman scattering from encapsulated transition metal dichalcogenide layers
• Geometric band properties in strained monolayer transition metal dichalcogenides using simple band structures
• Retrieval of material properties of monolayer transition-metal dichalcogenides from magnetoexciton energy spectra
• Tunable effective masses of magneto-excitons in two-dimensional materials
• Thermal effect on magnetoexciton energy spectra in monolayer transition metal dichalcogenides
• Excitons in Atomically Thin TMD in Electric and Magnetic Fields
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Analytical exciton energies in monolayer transition-metal dichalcogenides
• Retrieval of fundamental material parameters of monolayer transition metal dichalcogenides from experimental exciton energies: An analytical approach
• Rydberg series of intralayer K-excitons in WSe${}_2$ multilayers
• High-temperature observation of intralayer, interlayer, and Rydberg excitons in bulk van der Waals alloy single crystals
• Long-living excited states of a 2D diamagnetic exciton
• Brightening interlayer excitons by electric-field-driven hole transfer in bilayer WSe2
• Excited Rydberg States in TMD Heterostructures