Control of the Exciton Radiative Lifetime in van der Waals Heterostructures

Abstract

Optical properties of atomically thin transition metal dichalcogenides are controlled by robust excitons characterized by a very large oscillator strength. Encapsulation of monolayers such as MoSe${}_2$ in hexagonal boron nitride (hBN) yields narrow optical transitions approaching the homogenous exciton linewidth. We demonstrate that the exciton radiative rate in these van der Waals heterostructures can be tailored by a simple change of the hBN encapsulation layer thickness as a consequence of the Purcell effect. The time-resolved photoluminescence measurements together with cw reflectivity and photoluminescence experiments show that the neutral exciton spontaneous emission time can be tuned by one order of magnitude depending on the thickness of the surrounding hBN layers. The inhibition of the radiative recombination can yield spontaneous emission time up to $10$~ps. These results are in very good agreement with the calculated recombination rate in the weak exciton-photon coupling regime. The analysis shows that we are also able to observe a sizeable enhancement of the exciton radiative decay rate. Understanding the role of these electrodynamical effects allow us to elucidate the complex dynamics of relaxation and recombination for both neutral and charged excitons.

References in corpus (26)

• Observation of tightly bound trions in monolayer MoS2
• Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
• Excitons in atomically thin transition metal dichalcogenides
• Low-temperature photocarrier dynamics in monolayer MoS2
• Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
• Intrinsic Exciton Linewidth in Monolayer Transition Metal Dichalcogenides
• Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
• Exciton Radiative Lifetime in Transition Metal Dichalcogenide Monolayers
• Valley dynamics probed through charged and neutral exciton emission in monolayer WSe2
• Carrier and polarization dynamics in monolayer MoS2
• In-plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules
• Two-dimensional semiconductors in the regime of strong light-matter coupling
• Exciton fine structure and spin decoherence in monolayers of transition metal dichalcogenides
• Magneto-Optics of Exciton Rydberg States in a Monolayer Semiconductor
• Atomically thin mirrors made of monolayer semiconductors
• Radiative control of dark excitons at room temperature by nano-optical antenna-tip induced Purcell effect
• Phonon Sidebands in Transition Metal Dichalcogenides
• Realization of an atomically thin mirror using monolayer MoSe2
• Exciton-phonon coupling in MoSe2 monolayers
• Gate controlled spin-valley locking of resident carriers in WSe2 monolayers
• Probing the spin-polarized electronic band structure in monolayer transition metal dichalcogenides by optical spectroscopy
• Optical spectroscopy of excited exciton states in MoS2 monolayers in van der Waals heterostructures
• Exciton Relaxation Cascade in Two-dimensional Transition-metal dichalcogenides
• Tuning valley polarization in a WSe2 monolayer with a tiny magnetic field
• Cross-over from trion-hole to exciton-polaron in n-doped semiconductor quantum wells
• Theory of intervalley Coulomb interactions in monolayer transition-metal dichalcogenides

Cited by in corpus (66)

• Nonlinear polaritons in monolayer semiconductor coupled to optical bound states in the continuum
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
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• Quantum Nanophotonics in Two-Dimensional Materials
• Filtering the photoluminescence spectra of atomically thin semiconductors with graphene
• Optical properties of charged excitons in two-dimensional semiconductors
• Accessing high optical quality of MoS2 monolayers grown by chemical vapor deposition
• Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas
• Classical antennae, quantum emitters, and densities of optical states
• Near-unity light absorption in a monolayer WS2 van der Waals heterostructure cavity
• Guide to optical spectroscopy of layered semiconductors
• Exciton-Scattering-Induced Dephasing in Two-Dimensional Semiconductors
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Electrically controlled emission from singlet and triplet exciton species in atomically thin light emitting diodes
• Nanoscale modification of WS${}_2$ trion emission by its local electromagnetic environment
• Unveiling valley lifetimes of free charge carriers in monolayer WSe${}_2$
• Exciton valley depolarization in monolayer transition-metal dichalcogenides
• Prominent room temperature valley polarization in WS2/graphene heterostructures grown by chemical vapor deposition
• Electron recoil effect in electrically tunable MoSe2 monolayers
• Transition metal dichalcogenide dimer nano-antennas with ultra-small gaps
• Coherent dynamics and mapping of excitons in single-layer MoSe${}_2$ and WSe${}_2$ at the homogeneous limit
• Coherent Control of Two-Dimensional Excitons
• Substrate influence on transition metal dichalcogenide monolayer exciton absorption linewidth broadening
• Tunable Feshbach resonances and their spectral signatures in bilayer semiconductors
• Exciton fine structure splitting and linearly polarized emission in strained transition-metal dichalcogenide monolayers
• Exciton-polaritons in multilayer WSe${}_2$ in a planar microcavity
• Optical and dielectric properties of MoO${}_3$ nanosheets for van der Waals heterostructures
• Control of the exciton valley dynamics in van der Waals heterostructures
• Optical properties of exciton in two-dimensional transition metal dichalcogenide nanobubbles
• Wigner Crystals in Two-Dimensional Transition-Metal Dichalcogenides: Spin Physics and Readout
• Engineering 2D material exciton lineshape with graphene/h-BN encapsulation
• Light-matter coupling and non-equilibrium dynamics of exchange-split trions in monolayer WS2
• Optical properties of MoSe${}_2$ monolayer implanted with ultra-low energy Cr ions
• Distance dependence of the energy transfer mechanism in WS${}_2$-graphene heterostructures
• Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
• Electrically Tunable Interband Collective Excitations in Biased Bilayer and Trilayer Graphene
• Spin-valley relaxation dynamics of Landau-quantized electrons in MoSe${}_2$ monolayer
• Plasmonic photonic crystal mirror for long-lived interlayer exciton generation
• Reduced absorption due to defect-localized interlayer excitons in transition metal dichalcogenide-graphene heterostructures
• Magnetically tunable exciton valley coherence in monolayer WS${}_2$ mediated by the electron-hole exchange and exciton-phonon interactions
• Excitonic insulator phase and dynamics of condensate in a topological one-dimensional model
• Electromagnetic field assisted exciton diffusion in moiré superlattices
• Excitons and trions with negative effective masses in two-dimensional semiconductors
• Electrically controlled emission from triplet charged excitons in atomically thin heterostructures
• Controlling relaxation dynamics of excitonic states in monolayer transition metal dichalcogenides WS2 through interface engineering
• Imaging Seebeck drift of excitons and trions in MoSe2 monolayers
• The Importance of Pure Dephasing in the Optical Response of Excitons in High-quality van der Waals Heterostructures
• Longitudinal-transverse splitting and fine structure of Fermi polarons in two-dimensional semiconductors
• Excitons and trions in CrSBr bilayers
• Single- and narrow-line photoluminescence in a boron nitride-supported MoSe${}_2$/graphene heterostructure
• Pairing of electro-magnetic bosons under spin-orbit coupling
• MaskTerial: A Foundation Model for Automated 2D Material Flake Detection
• All-optical control of excitons in semiconductor quantum wells
• Excitonic bound states in the continuum in van der Waals heterostructure metasurfaces
• Spin dependent charge transfer in MoSe2/hBN/Ni hybrid structures
• Photoluminescence efficiency of MBE-grown MoSe${}_2$ monolayers featuring sharp excitonic lines and diverse grain structures
• Electrical Control of Excitons in Bare-MoSe2 and MoSe2/NbSe2 Heterostructure
• Polarized and narrow excitonic emission from graphene-capped monolayer WS${}_2$ through resonant phonon relaxation
• Interlayer exciton mediated second harmonic generation in bilayer MoS2
• Dielectric environment engineering via 2D material heterostructure formation on hybrid photonic crystal nanocavity
• Organic-Inorganic Polaritonics: Linking Frenkel and Wannier-Mott Excitons
• Multistable excitonic Stark effect
• Controllable fusion of electromagnetic bosons in two-dimensional semiconductors
• Dynamics of resonantly excited excitons in MoSe${}_2$ and WS${}_2$ single-layers monitored with four-wave mixing
• Unconventional bright ground-state excitons in monolayer TiI${}_2$ from first-principles calculations
• Suppression and amplification of phonon sidebands in transition metal dichalcogenides by optical feedback