Signatures of moiré-trapped valley excitons in MoSe${}_2$/WSe${}_2$ heterobilayers

Abstract

The creation of moiré patterns in crystalline solids is a powerful approach to manipulate their electronic properties, which are fundamentally influenced by periodic potential landscapes. In 2D materials, a moiré pattern with a superlattice potential can form by vertically stacking two layered materials with a twist and/or finite lattice constant difference. This unique approach has led to emergent electronic phenomena, including the fractal quantum Hall effect, tunable Mott insulators, and unconventional superconductivity. Furthermore, theory predicts intriguing effects on optical excitations by a moiré potential in 2D valley semiconductors, but these signatures have yet to be experimentally detected. Here, we report experimental evidence of interlayer valley excitons trapped in a moiré potential in MoSe${}_2$/WSe${}_2$ heterobilayers. At low temperatures, we observe photoluminescence near the free interlayer exciton energy but with over 100 times narrower linewidths. The emitter g-factors are homogeneous across the same sample and only take two values, -15.9 and 6.7, in samples with twisting angles near 60° and 0°, respectively. The g-factors match those of the free interlayer exciton, which is determined by one of two possible valley pairing configurations. At a twist angle near 20°, the emitters become two orders of magnitude dimmer, but remarkably, they possess the same g-factor as the heterobilayer near 60°. This is consistent with the Umklapp recombination of interlayer excitons near the commensurate 21.8° twist angle. The emitters exhibit strong circular polarization, which implies the preservation of three-fold rotation symmetry by the trapping potential. Together with the power and excitation energy dependence, all evidence points to their origin as interlayer excitons trapped in a smooth moiré potential with inherited valley-contrasting physics.

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• Thermal dynamics and electronic temperature waves in layered correlated materials
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• The optical response of artificially twisted MoS${}_2$ bilayers
• Polaritonic Quantum Matter
• Lattice reconstruction in MoSe${}_2$-WSe${}_2$ heterobilayers synthesized by chemical vapor deposition
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• Nonlocal Exciton-Photon Interactions in Hybrid High-Q Beam Nanocavities with Encapsulated MoS${}_2$ Monolayers
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• Moiré circuits: engineering magic-angle behaviors
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• Direct observation of locally modified excitonic effect within a moiré unit cell in twisted bilayer graphene
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• Tuning color centers at a twisted interface
• Robustness of momentum-indirect interlayer excitons in MoS2/WSe2 heterostructure against charge carrier doping
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• Moiré excitons in generalized Wigner crystals
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• Highly tunable quantum light from moiré trapped excitons
• Electrically tunable MoSe${}_2$/WSe${}_2$ heterostructure-based quantum dot
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Purely electronic model for exciton-polaron formation in moiré heterostructures
• Theory of phonon sidebands in the absorption spectra of moiré exciton-polaritons
• Laterally Extended States of Interlayer Excitons in Reconstructed MoSe${}_2$/WSe${}_2$ Heterostructures
• Engineering topological exciton structures in two-dimensional semiconductors by a periodic electrostatic potential
• Dielectric environment engineering via 2D material heterostructure formation on hybrid photonic crystal nanocavity
• Frequency comb in twisted magnonic crystals
• Topological domain-wall states from Umklapp scattering in twisted bilayer graphene
• Long-range spatial extension of exciton states in van der Waals heterostructure
• Moiré spintronics: Emergent phenomena, material realization and machine learning accelerating discovery
• Hierarchical Disorder in Moiré Exciton Photoluminescence Probed by Spectral-Descriptor Correlations
• Topological spin-up triplet excitonic condensation in two-dimensional electron-hole systems
• Coulomb potential screening via charged carriers and charge-neutral dipoles/excitons in two-dimensional case
• Magnetic structures on locally inverted interlayer coupling region of bilayer magnetic system
• Low-frequency and Moiré Floquet engineering: a review
• Angle-dependence of interlayer coupling in twisted transition metal dichalcogenide heterobilayers
• Entanglement smectic and stripe order
• Electrically tunable stacking domains and ferroelectricity in moiré superlattices
• Magnetic and nematic order of Bose-Fermi mixtures in moiré superlattices of 2D semiconductors
• Designer quantum matter in van der Waals heterostructures
• Deciphering the Intense Post-Gap Absorptions of Monolayer Transition Metal Dichalcogenides
• Non-local interactions and supersolidity of moiré excitons
• Amplification of valley polarization in an hBN-separated MoSe2-WSe2 heterostructure
• Gate-modulated reflectance spectroscopy for detecting excitonic species in two-dimensional semiconductors
• Realization of Nearly Dispersionless Bands with Strong Orbital Anisotropy from Destructive Interference in Twisted Bilayer MoS2
• Magnetically-Sensitive Valley Polarization Reversal and Revival of Defect-Localized Excitons in WSe2-WS2
• Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators
• Scalable and deterministic construction of moiré superlattice in 2D materials using stressor films
• Graphene as a Tunable Nonradiative Bath for Moiré Excitons
• Robust Interlayer Exciton Interplay in Twisted van der Waals Heterotrilayer on a Broadband Bragg Reflector up to Room Temperature
• Localized Interlayer Excitons in MoSe2-WSe2 Heterostructures without a Moiré Potential
• Observation of symmetry-protected selection rules in periodically driven quantum systems
• Probing spatially resolved spin density correlations with trapped excitons
• Moiré exciton dynamics and moiré exciton-phonon interaction in a WSe${}_2$/MoSe${}_2$ heterobilayer