Moiré excitons in MoSe${}_2$-WSe${}_2$ heterobilayers and heterotrilayers

Abstract

Layered two-dimensional materials exhibit rich transport and optical phenomena in twisted or lattice-incommensurate heterostructures with spatial variations of interlayer hybridization arising from moiré interference effects. Here, we report experimental and theoretical studies of excitons in twisted heterobilayers and heterotrilayers of transition metal dichalcogenides. Using MoSe${}_2$-WSe${}_2$ stacks as representative realizations of twisted van der Waals bilayer and trilayer heterostructures, we observe contrasting optical signatures and interpret them in the theoretical framework of interlayer moiré excitons in different spin and valley configurations. We conclude that the photoluminescence of MoSe${}_2$-WSe${}_2$ heterobilayer is consistent with joint contributions from radiatively decaying valley-direct interlayer excitons and phonon-assisted emission from momentum-indirect reservoirs that reside in spatially distinct regions of moiré supercells, whereas the heterotrilayer emission is entirely due to momentum-dark interlayer excitons of hybrid-layer valleys. Our results highlight the profound role of interlayer hybridization for transition metal dichalcogenide heterostacks and other realizations of multi-layered semiconductor van der Waals heterostructures.

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Cited by in corpus (25)

• Formation of moiré interlayer excitons in space and time
• Excitons in mesoscopically reconstructed moiré heterostructures
• Twist Angle Tuning of Moiré Exciton Polaritons in van der Waals Heterostructures
• Moiré induced topology and flat bands in twisted bilayer WSe${}_2$: A first-principles study
• Stacking-dependent exciton multiplicity in WSe${}_2$ bilayers
• Moiré-induced optical non-linearities: Single and multi-photon resonances
• 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
• Chiral photonic super-crystals based on helical van der Waals homostructures
• Lattice reconstruction in MoSe${}_2$-WSe${}_2$ heterobilayers synthesized by chemical vapor deposition
• Intrinsic circularly-polarized exciton emission in a twisted van-der-Waals heterostructure
• Impact of atomic reconstruction on optical spectra of twisted TMD homobilayers
• Interlayer excitonic spectra of vertically stacked MoSe${}_2$/WSe${}_2$ heterobilayers
• Approaching the Intrinsic Properties of Moiré Structures Using Atomic Force Microscopy Ironing
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Hybrid moiré excitons and trions in twisted MoTe${}_2$-MoSe${}_2$ heterobilayers
• Moiré exciton condensate: nonlinear Dirac point, broken-symmetry Bloch waves and unusual optical selection rules
• Layer-dependent optically-induced spin polarization in InSe
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• Robust Interlayer Exciton Interplay in Twisted van der Waals Heterotrilayer on a Broadband Bragg Reflector up to Room Temperature