Moiré Excitons Correlated with Superlattice Structure in Twisted WSe${}_2$/WSe${}_2$ Homobilayers

Abstract

Moiré superlattices in twisted van der Waals materials constitute a promising platform for engineering electronic and optical properties. However, a major obstacle to fully understanding these systems and harnessing their potential is the limited ability to correlate the local moiré structure with optical properties. By using a recently developed scanning electron microscopy technique to image twisted WSe${}_2$/WSe${}_2$ bilayers, we directly correlate increasing moiré periodicity with the emergence of two distinct exciton species. These can be tuned individually through electrostatic gating, and feature different valley coherence properties. Our observations can be understood as resulting from an array of two intralayer exciton species residing in alternating locations in the superlattice, and illuminate the influence of the moiré potential on lateral exciton motion. They open up new avenues for controlling exciton arrays in twisted TMDs, with applications in quantum optoelectronics and explorations of novel many body systems.

arXiv comment25 pages, 4 figures in main text, 4 figures in supplementary materials

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Cited by in corpus (46)

• Interfacial ferroelectricity in rhombohedral-stacked bilayer transition metal dichalcogenides
• Interfacial ferroelectricity in marginally twisted 2D semiconductors
• Spontaneous Polarization Induced Photovoltaic Effect In Rhombohedrally Stacked MoS${}_2$
• Lattice reconstruction induced multiple ultra-flat bands in twisted bilayer WSe2
• Excitons in mesoscopically reconstructed moiré heterostructures
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Imaging moiré deformation and dynamics in twisted bilayer graphene
• Roadmap for Photonics with 2D Materials
• Optical signatures of charge order in a Mott-Wigner state
• A perspective of twisted photonic structures
• Moiré-trapped interlayer trions in a charge-tunable WSe${}_2$/MoSe${}_2$ heterobilayer
• Visualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures
• Second harmonic generation control in twisted bilayers of transition metal dichalcogenides
• Electrically controlled emission from singlet and triplet exciton species in atomically thin light emitting diodes
• Optical read-out of Coulomb staircases in a moiré superlattice via trapped interlayer trions
• Reconstruction of moiré lattices in twisted transition metal dichalcogenide bilayers
• Phonon-assisted inter-valley scattering determines ultrafast exciton dynamics in MoSe${}_2$ bilayers
• Stacking-dependent exciton multiplicity in WSe${}_2$ bilayers
• Moiré induced topology and flat bands in twisted bilayer WSe${}_2$: A first-principles study
• Ultra Localized Optoelectronic Properties of Nanobubbles in 2D Semiconductors
• An atomistic insight into moiré reconstruction in Twisted Bilayer Graphene beyond the magic angle
• Flat-band plasmons in twisted bilayer transition metal dichalcogenides
• Leaky exciton condensates in transition metal dichalcogenide moiré bilayers
• Excitonic Absorption Signatures of Twisted Bilayer WSe${}_2$ by Electron Energy-Loss Spectroscopy
• Multi-layered atomic relaxation in van der Waals heterostructures
• Staggered Pseudo Magnetic Field in Twisted Transition Metal Dichalcogenides: Physical Origin and Experimental Consequences
• Lattice reconstruction in MoSe${}_2$-WSe${}_2$ heterobilayers synthesized by chemical vapor deposition
• Switching between Mott-Hubbard and Hund physics in moiré quantum simulators
• Impact of atomic reconstruction on optical spectra of twisted TMD homobilayers
• Tuning exciton complexes in twisted bilayer WSe2 at intermediate misorientation
• Intrinsic circularly-polarized exciton emission in a twisted van-der-Waals heterostructure
• Controlled Interlayer Exciton Ionization in an Electrostatic Trap in Atomically Thin Heterostructures
• Tuning flat bands by interlayer interaction, spin-orbital coupling, and external fields in twisted homotrilayer MoS${}_2$
• Impurity-induced excitations in a topological two-dimensional ferromagnet/superconductor van der Waals moiré heterostructure
• Polarization and charge-separation of moiré excitons in van der Waals heterostructures
• Microscopic theory of nonlinear phase space filling in polaritonic lattices
• Plasmonic polarization sensing of electrostatic superlattice potentials
• Light driven magnetic transitions in transition metal dichalcogenide heterobilayers
• Moiré Modulation of Charge Density Waves
• Sliding ferroelectricity in a bulk misfit layer compound (PbS)${}_{1.18}$VS${}_2$
• Ultrasonic Delamination Based Adhesion Testing for High-Throughput Assembly of van der Waals Heterostructures
• Mesoscopic Stacking Reconfigurations in Stacked van der Waals Film
• Atomic relaxation and flat bands in strain-engineered transition metal dichalcogenide bilayer moiré systems
• Sieve of Eratosthenes for Bose-Einstein Condensates in Optical Moiré Lattices
• Moire-Engineered Excitonic Landscape and Phonon-Mediated Recombination in Twisted WSe2 Bilayers
• Realization of Nearly Dispersionless Bands with Strong Orbital Anisotropy from Destructive Interference in Twisted Bilayer MoS2