Polarization and time-resolved photoluminescence spectroscopy of excitons in MoSe2 monolayers

Abstract

We investigate valley exciton dynamics in MoSe2 monolayers in polarization- and time-resolved photoluminescence (PL) spectroscopy at 4K. Following circularly polarized laser excitation, we record a low circular polarization degree of the PL of typically $\le 5\%$. This is about 10 times lower than the polarization induced under comparable conditions in MoS2 and WSe2 monolayers. The evolution of the exciton polarization as a function of excitation laser energy and power is monitored in PL excitation (PLE) experiments. Fast PL emission times are recorded for both the neutral exciton of $\le 3$ ps and for the charged exciton (trion) of 12 ps.

arXiv comment4 pages, 3 figures

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• Control of interlayer excitons in two-dimensional van der Waals heterostructures
• Room temperature Tamm-Plasmon Exciton-Polaritons with a WSe2 monolayer
• Optical properties of atomically thin transition metal dichalcogenides: Observations and puzzles
• Spin-orbit engineering in transition metal dichalcogenide alloy monolayers
• Exciton Dynamics in Monolayer Transition Metal Dichalcogenides
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
• Control of Exciton Valley Coherence in Transition Metal Dichalcogenide Monolayers
• A- and B-Exciton Photoluminescence Intensity Ratio as a Measure of Sample Quality for Transition Metal Dichalcogenide Monolayers
• Exciton and trion dynamics in atomically thin MoSe2 and WSe2: effect of localization
• Measurement of the Spin-Forbidden Dark Excitons in MoS2 and MoSe2 monolayers
• Polarization analysis of excitons in monolayer and bilayer transition-metal dichalcogenides
• Direct exciton emission from atomically thin transition metal dichalcogenide heterostructures near the lifetime limit
• Moiré Intralayer Excitons in a MoSe${}_2$/MoS${}_2$ Heterostructure
• Magneto-optics in transition metal diselenide monolayers
• Probing the inter-layer exciton physics in a MoS${}_2$/MoSe${}_2$/MoS${}_2$ van der Waals heterostructure
• Spin and valley dynamics of excitons in transition metal dichalcogenides monolayers
• Optical response of monolayer, few-layer and bulk tungsten disulfide
• Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor
• Discrete quantum dot like emitters in monolayer MoSe2: Spatial mapping, Magneto-optics and Charge tuning
• Highly Valley-Polarized Singlet and Triplet Interlayer Excitons in van der Waals Heterostructure
• Kinetic Magnetism in Triangular Moiré Materials
• Exciton states in monolayer MoSe2: impact on interband transitions
• Excitonic properties of semiconducting monolayer and bilayer MoTe2
• Dark excitons and the elusive valley polarization in transition metal dichalcogenides
• Ultra-low power threshold for laser induced changes in optical properties of 2D Molybdenum dichalcogenides
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• Defect healing and charge transfer mediated valley polarization in MoS${}_2$/MoSe${}_2$/MoS${}_2$ trilayer van der Waals heterostructures
• Anomalous temperature-dependent spin-valley polarization in monolayer WS${}_2$
• Valley Trion Dynamics in Monolayer MoSe${}_2$
• Optomechanical measurement of thermal transport in two-dimensional MoSe2 lattices
• Observation of exciton-exciton interaction mediated valley depolarization in monolayer MoSe${}_2$
• Trion Valley Coherence in Monolayer Semiconductors
• Room Temperature Valley Polarization and Coherence in Transition Metal Dichalcogenide-Graphene van der Waals Heterostructures
• Novel valley depolarization dynamics and valley Hall effect of exciton in mono- and bilayer MoS${}_2$
• Superior valley polarization and coherence of 2s excitons in monolayer WSe2
• Theory of intervalley Coulomb interactions in monolayer transition-metal dichalcogenides
• Optical read-out of Coulomb staircases in a moiré superlattice via trapped interlayer trions
• Valley polarized relaxation and upconversion luminescence from Tamm-Plasmon Trion-Polaritons with a MoSe2 monolayer
• Trion Species-Resolved Quantum Beats in MoSe2
• Optical control of valley Zeeman effect through many-exciton interactions
• Exciton valley depolarization in monolayer transition-metal dichalcogenides
• Review of Ultrafast Spectroscopy Studies of Valley Carrier Dynamics in Two Dimensional Semiconducting Transition Metal Dichalcogenides
• Phonon-assisted inter-valley scattering determines ultrafast exciton dynamics in MoSe${}_2$ bilayers
• Band nesting, massive Dirac Fermions and Valley Lande and Zeeman effects in transition metal dichalcogenides: a tight-binding model
• Quenching of Intervalley Exchange Coupling in the Presence of Momentum-Dark States in TMDCs
• Measuring valley polarization in two-dimensional materials with second-harmonic spectroscopy
• Prolonging Valley Polarization Lifetime through Gate-Controlled Exciton-to-Trion Conversion in Monolayer Molybdenum Ditelluride
• Enhancement of Exciton Valley Polarization in Monolayer MoS2 Induced by Scattering
• Valley Dynamics of Excitons in Monolayer Dichalcogenides
• Resonantly excited exciton dynamics in two-dimensional MoSe${}_2$ monolayers
• Long-lived spin polarization in n-doped MoSe${}_2$ monolayers
• Excitonic theory of doping-dependent optical response in atomically thin semiconductors
• Dark-state impact on the exciton recombination of WS2 monolayers as revealed by multi-time-scale pump-and-probe spectroscopy
• Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
• Inducing room-temperature valley polarization of excitonic emission in transition metal dichalcogenide monolayers
• Impact of optically pumped non-equilibrium steady states on luminescence emission of atomically-thin semiconductor excitons
• Magnetic field mixing and splitting of bright and dark excitons in monolayer MoSe2
• Magnetic field control of light-induced spin accumulation in monolayer MoSe${}_2$
• Single- and narrow-line photoluminescence in a boron nitride-supported MoSe${}_2$/graphene heterostructure
• Valley polarization of trions in monolayer MoSe${}_2$ interfaced with bismuth iron garnet
• Assessment of valley coherence in a high-quality monolayer molybdenum diselenide
• Heteroepitaxial growth of high optical quality, wafer-scale van der Waals heterostrucutres
• Valley pseudospin relaxation of charged excitons in monolayer MoTe${}_2$
• Excitonic Transport and Intervalley Scattering in Exfoliated MoSe2 Monolayer Revealed by Four-Wave-Mixing Transient Grating Spectroscopy