Twist Angle Dependent Interlayer Exciton Lifetimes in van der Waals Heterostructures

Abstract

In van der Waals (vdW) heterostructures formed by stacking two monolayers of transition metal dichalcogenides, multiple exciton resonances with highly tunable properties are formed and subject to both vertical and lateral confinement. We investigate how a unique control knob, the twist angle between the two monolayers, can be used to control the exciton dynamics. We observe that the interlayer exciton lifetimes in ${\text{MoSe}}_{\text{2}}$/${\text{WSe}}_{\text{2}}$ twisted bilayers (TBLs) change by one order of magnitude when the twist angle is varied from 1${}^{\circ }$ to 3.5${}^{\circ }$. Using a low-energy continuum model, we theoretically separate two leading mechanisms that influence interlayer exciton radiative lifetimes. The shift to indirect transitions in the momentum space with an increasing twist angle and the energy modulation from the moiré potential both have a significant impact on interlayer exciton lifetimes. We further predict distinct temperature dependence of interlayer exciton lifetimes in TBLs with different twist angles, which is partially validated by experiments. While many recent studies have highlighted how the twist angle in a vdW TBL can be used to engineer the ground states and quantum phases due to many-body interaction, our studies explore its role in controlling the dynamics of optically excited states, thus, expanding the conceptual applications of "twistronics".

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• Moiré-Bose-Hubbard model for interlayer excitons in twisted transition metal dichalcogenide heterostructures
• Localization and interaction of interlayer excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• Lasing of Moiré Trapped MoSe${}_2$/WSe${}_2$ Interlayer Excitons Coupled to a Nanocavity
• Electrical tuning of moiré excitons in MoSe${}_2$ bilayers
• Spatially indirect intervalley excitons in bilayer WSe2
• A room-temperature moiré interlayer exciton laser
• Coherent exciton-exciton interactions and exciton dynamics in a MoSe\textsubscript{2}/WSe\textsubscript{2} heterostructure
• Charge transfer dynamics in MoSe${}_2$/hBN/WSe${}_2$ heterostructures
• Imaging dynamic exciton interactions and coupling in transition metal dichalcogenides
• Twist-dependent intra- and interlayer excitons in moire MoSe2 homobilayers
• Optical signature of cascade transitions between moiré interlayer excitons
• Twist angle dependent interlayer transfer of valley polarization from excitons to free charge carriers in WSe${}_2$/MoSe${}_2$ heterobilayers
• Leaky exciton condensates in transition metal dichalcogenide moiré bilayers
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• Thickness and twist angle dependent interlayer excitons in metal monochalcogenide heterostructures
• Impact of atomic reconstruction on optical spectra of twisted TMD homobilayers
• Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer
• Intrinsic circularly-polarized exciton emission in a twisted van-der-Waals heterostructure
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• One-dimensional electronic states in a natural misfit structure
• Plasmonic Quantum Dots in Twisted Bilayer Graphene
• Optical Signatures of Moiré Trapped Biexcitons
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• Dynamic Valley Polarization in Moire Quantum Dots
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