Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure

Abstract

In heterostructures consisting of different transition-metal dichalcogenide monolayers, a staggered band alignment can occur, leading to rapid charge separation of optically generated electron-hole pairs into opposite monolayers. These spatially separated electron-hole pairs are Coulomb-coupled and form interlayer excitons. Here, we study these interlayer excitons in a heterostructure consisting of MoSe${}_2$ and WSe${}_2$ monolayers using photoluminescence spectroscopy. We observe a non-trivial temperature dependence of the linewidth and the peak energy of the interlayer exciton, including an unusually strong initial redshift of the transition with temperature, as well as a pronounced blueshift of the emission energy with increasing excitation power. By combining these observations with time-resolved photoluminescence measurements, we are able to explain the observed behavior as a combination of interlayer exciton diffusion and dipolar, repulsive exciton-exciton interaction.

References in corpus (12)

• Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Micrometer-scale ballistic transport in encapsulated graphene at room temperature
• Strong interlayer coupling in van der Waals heterostructures built from single-layer chalcogenides
• Cross-sectional imaging of individual layers and buried interfaces of graphene-based heterostructures and superlattices
• Probing excitonic states in ultraclean suspended two-dimensional semiconductors by photocurrent spectroscopy
• Interlayer Exciton Optoelectronics in a 2D Heterostructure p-n Junction
• Measurement of high exciton binding energy in the monolayer transition-metal dichalcogenides WS2 and WSe2
• Analysis of the exciton-exciton interaction in semiconductor quantum wells
• Enabling valley selective exciton scattering in monolayer WSe${}_2$ through upconversion
• Directional Interlayer Spin-Valley Transfer in Two-Dimensional Heterostructures
• Drift mobility of long-living excitons in coupled GaAs quantum wells

Cited by in corpus (60)

• Moiré Excitons in Van der Waals Heterostructures
• Signatures of moiré-trapped valley excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors
• Electrical control of interlayer exciton dynamics in atomically thin heterostructures
• Long-lived direct and indirect interlayer excitons in van der Waals heterostructures
• Anomalous Interlayer Exciton Diffusion in Twist-Angle-Dependent Moiré Potentials of WS${}_2$-WSe${}_2$ Heterobilayers
• Momentum-space indirect interlayer excitons in transition metal dichalcogenide van der Waals heterostructures
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
• Double Indirect Interlayer Exciton in a MoSe2/WSe2 van der Waals Heterostructure
• Dipolar interactions between field-tuneable, localized emitters in van der Waals heterostructures
• Interlayer hybridization and moiré superlattice minibands for electrons and excitons in heterobilayers of transition-metal dichalcogenides
• Indirect excitons in van der Waals heterostructures at room temperature
• Design of van der Waals Interfaces for Broad-Spectrum Optoelectronics
• Microsecond dark-exciton valley polarization memory in 2D heterostructures
• Moiré Intralayer Excitons in a MoSe${}_2$/MoS${}_2$ Heterostructure
• Giant Stark splitting of an exciton in bilayer MoS${}_2$
• Correlated insulator of excitons in WSe2/WS2 moiré superlattices
• Discrete Interactions between a few Interlayer Excitons Trapped at a MoSe${}_2$-WSe${}_2$ Heterointerface
• Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure
• Localized bright luminescence of indirect excitons and trions in MoSe${}_2$/WSe${}_2$ van der Waals heterostructure
• Cavity-control of bright and dark interlayer excitons in van der Waals heterostructures
• Interlayer excitons in van der Waals heterostructures: Binding energy, Stark shift, and field-induced dissociation
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures
• Observation of Inter-layer Excitons in MoSe2 Single Crystals
• Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures
• Layer engineered interlayer excitons
• Moiré-trapped interlayer trions in a charge-tunable WSe${}_2$/MoSe${}_2$ heterobilayer
• Control of the orbital character of indirect excitons in MoS2/WS2 heterobilayers
• Localized interlayer complexes in heterobilayer transition metal dichalcogenides
• Time-domain observation of interlayer exciton formation and thermalization in a MoSe${}_2$/WSe${}_2$ heterostructure
• Microscopic origin of anomalous interlayer exciton transport in van der Waals heterostructures
• Biaxial strain tuning of interlayer excitons in bilayer MoS2
• Spin/valley coupled dynamics of electrons and holes at the ${\text{MoS}}_2-{\text{MoSe}}_2$ interface
• Light-matter interaction in van der Waals heterostructures
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Exciton-exciton interactions in van der Waals heterobilayers
• Interlayer exciton valley polarization dynamics in large magnetic fields
• Extrinsic localized excitons in patterned 2D semiconductors
• Leaky exciton condensates in transition metal dichalcogenide moiré bilayers
• Signatures of electric field and layer separation effects on the spin-valley physics of MoSe${}_2$/WSe${}_2$ heterobilayers: from energy bands to dipolar excitons
• Long-lived spin polarization in n-doped MoSe${}_2$ monolayers
• Magnetoexcitons in transition-metal dichalcogenides monolayers, bilayers, and van der Waals heterostructures
• Harmonic to anharmonic tuning of moiré potential leading to unconventional Stark effect and giant dipolar repulsion in WS${}_2$/WSe${}_2$ heterobilayer
• Anomalous exciton transport in response to a uniform, in-plane electric field
• Electrically tunable dipolar interactions between layer-hybridized excitons
• Quantum Geometric Exciton Drift Velocity
• Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer
• Interlayer excitonic spectra of vertically stacked MoSe${}_2$/WSe${}_2$ heterobilayers
• Gate-tunable trion switch for excitonic device applications
• Confined-state physics and signs of fermionization of moiré excitons in WSe${}_2$/MoSe${}_2$ heterobilayers
• Optical Signatures of Moiré Trapped Biexcitons
• Approaching the Intrinsic Properties of Moiré Structures Using Atomic Force Microscopy Ironing
• Interlayer exciton polaritons in homobilayers of transition metal dichalcogenides
• Two dimensional semiconductors: optical and electronic properties
• Theory of interlayer exciton dynamics in 2D TMDCs Heterolayers under the influence of strain reconstruction and disorder
• Hierarchical Disorder in Moiré Exciton Photoluminescence Probed by Spectral-Descriptor Correlations
• Limits of funneling efficiency in non-uniformly strained 2D semiconductors
• Ferroelectric Control of Interlayer Excitons in 3R-MoS${}_2$ / MoSe${}_2$ Heterostructures
• Robust Interlayer Exciton Interplay in Twisted van der Waals Heterotrilayer on a Broadband Bragg Reflector up to Room Temperature