Excitons in mesoscopically reconstructed moiré heterostructures

Abstract

Moiré effects in twisted or lattice-incommensurate vertical assemblies of two-dimensional crystals give rise to a new class of quantum materials with rich transport and optical phenomena, including correlated electron physics in flat bands of bilayer graphene and moiré excitons in semiconductor heterostructures. These phenomena arise from modulations of interlayer hybridization on the nanoscale of spatially varying atomic registries of moiré supercells. Due to finite elasticity, however, lattices of marginally-twisted homobilayers and heterostructures can transform from moiré to periodically reconstructed patterns with triangular or hexagonal tiling. Here, we expand the notion of nanoscale lattice reconstruction to the mesoscopic scale of extended samples and demonstrate rich consequences in optical studies of excitons in MoSe${}_2$-WSe${}_2$ heterostructures with parallel and antiparallel alignment. Our results provide a unified perspective on diverse and partly controversial signatures of moiré excitons in semiconductor heterostructures by identifying domains with exciton properties of distinct effective dimensionality and establish mesoscopic reconstruction as a compelling feature of real samples and devices with inherent finite-size effects and disorder. Generalized to stacks of other two-dimensional materials, this notion of mesoscale domain formation with emergent topological defects and percolation networks will instructively expand our understanding of fundamental electronic, optical, and magnetic properties of van der Waals heterostructures.

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Cited by in corpus (35)

• Roadmap for Photonics with 2D Materials
• Tunable moiré materials for probing Berry physics and topology
• Relaxation effects in twisted bilayer molybdenum disulfide: structure, stability, and electronic properties
• Extended spatial coherence of interlayer excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• Excitonic signatures of ferroelectric order in parallel-stacked MoS${}_2$
• Exciton-exciton interactions in van der Waals heterobilayers
• Field-induced hybridization of moiré excitons in MoSe${}_2$/WS${}_2$ heterobilayers
• 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
• Lattice reconstruction in MoSe${}_2$-WSe${}_2$ heterobilayers synthesized by chemical vapor deposition
• Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures
• Impact of atomic reconstruction on optical spectra of twisted TMD homobilayers
• Confined-state physics and signs of fermionization of moiré excitons in WSe${}_2$/MoSe${}_2$ heterobilayers
• Distinct Magneto-Optical Response of Frenkel and Wannier Excitons in CrSBr
• Creation and Microscopic Origins of Single-Photon Emitters in Transition Metal Dichalcogenides and Hexagonal Boron Nitride
• Optical Signatures of Moiré Trapped Biexcitons
• Hybrid moiré excitons and trions in twisted MoTe${}_2$-MoSe${}_2$ heterobilayers
• Polarization and charge-separation of moiré excitons in van der Waals heterostructures
• Electromagnetic field assisted exciton diffusion in moiré superlattices
• Long-distance decay-less spin transport in indirect excitons in a van der Waals heterostructure
• Two dimensional semiconductors: optical and electronic properties
• Stability of Wigner crystals and Mott insulators in twisted moiré structures
• Mesoscopic Stacking Reconfigurations in Stacked van der Waals Film
• Trion Engineered Multimodal Transistors in Two dimensional Bilayer Semiconductor Lateral Heterostructures
• Theory of interlayer exciton dynamics in 2D TMDCs Heterolayers under the influence of strain reconstruction and disorder
• Tunable exciton polaritons in band-gap engineered hexagonal boron nitride
• Electrically tunable MoSe${}_2$/WSe${}_2$ heterostructure-based quantum dot
• Review of the tight-binding method applicable to the properties of moiré superlattices
• Moiré excitons in generalized Wigner crystals
• Intersubband electric dipole spin resonance in transition metal dichalcogenide heterobilayers
• Long-range spatial extension of exciton states in van der Waals heterostructure
• Laterally Extended States of Interlayer Excitons in Reconstructed MoSe${}_2$/WSe${}_2$ Heterostructures
• Amplification of valley polarization in an hBN-separated MoSe2-WSe2 heterostructure
• The fate of disorder in twisted bilayer graphene near the magic angle
• Quantum siphoning of finely spaced interlayer excitons in reconstructed MoSe2/WSe2 heterostructures
• Effective long-range attraction of moiré excitons under the influence of atomic reconstructions and anisotropic screening