Filtering the photoluminescence spectra of atomically thin semiconductors with graphene

Abstract

Atomically thin semiconductors made from transition metal dichalcogenides (TMDs) are model systems for investigations of strong light-matter interactions and applications in nanophotonics, opto-electronics and valley-tronics. However, the photoluminescence spectra of TMD monolayers display a large number of features that are particularly challenging to decipher. On a practical level, monochromatic TMD-based emitters would be beneficial for low-dimensional devices but this challenge is yet to be resolved. Here, we show that graphene, directly stacked onto TMD monolayers enables single and narrow-line photoluminescence arising solely from TMD neutral excitons. This filtering effect stems from complete neutralization of the TMD by graphene combined with selective non-radiative transfer of long-lived excitonic species to graphene. Our approach is applied to four tungsten and molybdenum-based TMDs and establishes TMD/graphene heterostructures as a unique set of opto-electronic building blocks, suitable for electroluminescent systems emitting visible and near-infrared photons at near THz rate with linewidths approaching the lifetime limit.

arXiv commentMain manuscript with 5 figures plus supplementary information file (including 9 supplementary sections and 14 supplementary figures)

References in corpus (39)

• The electronic properties of graphene
• Atomically thin MoS2: A new direct-gap semiconductor
• Observation of tightly bound trions in monolayer MoS2
• Excitons in atomically thin transition metal dichalcogenides
• Electrical Control of Two-Dimensional Neutral and Charged Excitons in a Monolayer Semiconductor
• Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
• Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
• Picosecond photoresponse in van der Waals heterostructures
• Exciton Radiative Lifetime in Transition Metal Dichalcogenide Monolayers
• Magnetic brightening and control of dark excitons in monolayer WSe2
• Fast pick up technique for high quality heterostructures of bilayer graphene and hexagonal boron nitride
• Carrier and polarization dynamics in monolayer MoS2
• In-plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules
• Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons
• Energy Transfer from Individual Semiconductor Nanocrystals to Graphene
• Revealing exciton masses and dielectric properties of monolayer semiconductors with high magnetic fields
• Charged excitons in monolayer WSe${}_2$: experiment and theory
• Splitting between Bright and Dark excitons in Transition Metal Dichalcogenide Monolayers
• Charge-tuneable biexciton complexes in monolayer WSe${}_2$
• Revealing the Biexciton and Trion-exciton Complexes in BN Encapsulated WSe2
• Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation
• Atomically thin mirrors made of monolayer semiconductors
• Opto-Valleytronic Spin Injection in Monolayer MoS2/Few-Layer Graphene Hybrid Spin Valves
• Neutral and Charged Inter-Valley Biexcitons in Monolayer MoSe${}_2$
• Fine Structure and Lifetime of Dark Excitons in Transition Metal Dichalcogenide Monolayers
• Control of the Exciton Radiative Lifetime in van der Waals Heterostructures
• Electroluminescence from multi-particle exciton complexes in transition metal dichalcogenide semiconductors
• Realization of an atomically thin mirror using monolayer MoSe2
• The role of momentum-dark excitons in the elementary optical response of bilayer WSe${}_2$
• Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WSe2
• Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2
• Optospintronics in graphene via proximity coupling
• Biexciton, single carrier, and trion generation dynamics in single-walled carbon nanotubes
• Singlet and triplet trions in WS${}_2$ monolayer encapsulated in hexagonal boron nitride
• 2D condensate of electrons and holes in ultrathin MoTe${}_2$ photocells
• Ultra-low power threshold for laser induced changes in optical properties of 2D Molybdenum dichalcogenides
• Room Temperature Valley Polarization and Coherence in Transition Metal Dichalcogenide-Graphene van der Waals Heterostructures
• Theory of optically induced Förster Coupling in van der Waals coupled Heterostuctures
• Direct observation of ultrafast exciton formation in monolayer WSe${}_2$

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• Observation of Rydberg moiré excitons
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• Second- and third-order optical susceptibilities in bidimensional semiconductors near excitons states
• Picosecond energy transfer in a transition metal dichalcogenide-graphene heterostructure revealed by transient Raman spectroscopy
• Tip-induced excitonic luminescence nanoscopy of an atomically-resolved van der Waals heterostructure
• Substrate influence on transition metal dichalcogenide monolayer exciton absorption linewidth broadening
• Observation of ~100% valley-coherent excitons in monolayer MoS2 through giant enhancement of valley coherence time
• Engineering 2D material exciton lineshape with graphene/h-BN encapsulation
• Quantum Geometric Exciton Drift Velocity
• Electroluminescence of monolayer WS${}_2$ in a scanning tunneling microscope: the effect of bias polarity on the spectral and angular distribution of the emitted light
• Tuning exciton recombination rates in doped transition metaldichalcogenides
• Twisted MoSe2 Homobilayer Behaving as a Heterobilayer
• Magnon-exciton proximity coupling at a van der Waals heterointerface
• Distance dependence of the energy transfer mechanism in WS${}_2$-graphene heterostructures
• Enhanced exciton-exciton collisions in an ultra-flat monolayer MoSe2 prepared through deterministic flattening
• Nano-optics of transition metal dichalcogenides and their van der Waals heterostructures with electron spectroscopies
• Reduced absorption due to defect-localized interlayer excitons in transition metal dichalcogenide-graphene heterostructures
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Biaxial strain tuning of exciton energy and polarization in monolayer WS2
• Circular dichroism induction in WS2 by a chiral plasmonic metasurface
• Single- and narrow-line photoluminescence in a boron nitride-supported MoSe${}_2$/graphene heterostructure
• Polarized and narrow excitonic emission from graphene-capped monolayer WS${}_2$ through resonant phonon relaxation
• Designable exciton mixing through layer alignment in WS${}_2$-graphene heterostructures
• Electrical Control of Excitons in Bare-MoSe2 and MoSe2/NbSe2 Heterostructure
• Graphene as a Tunable Nonradiative Bath for Moiré Excitons
• Many-body effects in suspended graphene probed through magneto-phonon resonances