Theory of moiré localized excitons in transition-metal dichalcogenide heterobilayers

Abstract

Transition-metal dichalcogenide heterostructures exhibit moiré patterns that spatially modulate the electronic structure across the material's plane. For certain material pairs, this modulation acts as a potential landscape with deep, trigonally symmetric wells capable of localizing interlayer excitons, forming periodic arrays of quantum emitters. Here, we study these moiré localized exciton states and their optical properties. By numerically solving the two-body problem for an interacting electron-hole pair confined by a trigonal potential, we compute the localized exciton spectra for different pairs of materials. We derive optical selection rules for the different families of localized states, each belonging to one of the irreducible representations of the potential's symmetry group $C_{3v}$, and numerically estimate their polarization-resolved absorption spectra. We find that the optical response of localized moiré interlayer excitons is dominated by states belonging to the doubly-degenerate $E$ irreducible representation. Our results provide new insights into the optical properties of artificially confined excitons in two-dimensional semiconductors.

arXiv comment6 appendices; 10 figures

References in corpus (41)

• Atomically thin MoS2: A new direct-gap semiconductor
• Control of valley polarization in monolayer MoS2 by optical helicity
• Valley polarization in MoS2 monolayers by optical pumping
• MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
• Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
• Moiré Excitons in Van der Waals Heterostructures
• Signatures of moiré-trapped valley excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Probing Excitonic Dark States in Single-layer Tungsten Disulfide
• Theory of Neutral and Charged Excitons in Monolayer Transition Metal Dichalcogenides
• Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
• Band alignment of two-dimensional transition metal dichalcogenides: application in tunnel field effect transistors
• Electronic structures and theoretical modelling of two-dimensional group-VIB transition metal dichalcogenides
• Moiré excitons: from programmable quantum emitter arrays to spin-orbit coupled artificial lattices
• Atomic reconstruction in twisted bilayers of transition metal dichalcogenides
• Moiré superlattice in a MoSe${}_2$/hBN/MoSe${}_2$ heterostructure: from coherent coupling of inter- and intra-layer excitons to correlated Mott-like states of electrons
• In-plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules
• Topological Exciton Bands in Moiré Heterojunctions
• Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
• Atomic reconstruction and moiré patterns in transition metal dichalcogenide van der Waals heterostructures
• Momentum-space indirect interlayer excitons in transition metal dichalcogenide van der Waals heterostructures
• Topological mosaic in Moiré superlattices of van der Waals heterobilayers
• Anomalous light cones and valley optical selection rules of interlayer excitons in twisted heterobilayers
• Stacking domains and dislocation networks in marginally twisted bilayers of transition metal dichalcogenides
• Interlayer coupling in commensurate and incommensurate bilayer structures of transition metal dichalcogenides
• Shubnikov-de Haas oscillations of high mobility holes in monolayer and bilayer WSe${}_2$: Landau level degeneracy, effective mass, and negative compressibility
• Brightened spin-triplet interlayer excitons and optical selection rules in van der Waals heterobilayers
• Interlayer hybridization and moiré superlattice minibands for electrons and excitons in heterobilayers of transition-metal dichalcogenides
• Spin-layer locking of interlayer excitons trapped in moiré potentials
• Interactions and magnetotransport through spin-valley coupled Landau levels in monolayer MoS${}_2$
• Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides
• Large effective mass and interaction-enhanced Zeeman splitting of $K$-valley electrons in MoSe${}_2$
• Acceptor binding energies in GaN and AlN
• Ambipolar Landau levels and strong band-selective carrier interactions in monolayer WSe${}_2$
• Electronic, optical and transport properties of van der Waals Transition-metal Dichalcogenides Heterostructures: A First-principle Study
• Localized interlayer complexes in heterobilayer transition metal dichalcogenides
• Zeeman splitting of shallow donors in GaN
• Spectrum of exciton states in monolayer transition metal dichalcogenides: angular momentum and Landau levels
• Moiré lattice-induced formation and tuning of hybrid dipolar excitons in twisted WS${}_2$/MoSe${}_2$ heterobilayers

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• Floquet-engineering topological transitions in a twisted transition metal dichalcogenide homobilayer
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• Moiré band structures of twisted phosphorene bilayers
• Anomalous exciton transport in response to a uniform, in-plane electric field
• The strong modulation limit of excitons and trions in moiré materials
• Luminescence anomaly of dipolar valley excitons in homobilayer semiconductor moiré superlattices
• Tunable properties of excitons in double monolayer semiconductor heterostructures
• Microscopic theory of nonlinear phase space filling in polaritonic lattices
• Theory of interlayer exciton dynamics in 2D TMDCs Heterolayers under the influence of strain reconstruction and disorder
• Laterally Extended States of Interlayer Excitons in Reconstructed MoSe${}_2$/WSe${}_2$ Heterostructures
• Phonon-induced Markovian and non-Markovian effects on absorption spectra of moiré excitons in twisted transition metal dichalcogenide bilayers