Mott-moiré excitons

Abstract

We develop a systematic theory for excitons subject to Fermi-Hubbard physics in moiré twisted transition metal dichalcogenides (TMDs). Specifically, we consider excitons in moiré systems for which the valence band is in the Mott-insulating regime. These "Mott-moiré excitons", which are achievable in twisted TMD heterobilayers, are bound states of a magnetic polaron in the valence band and a free electron in the conduction band. We find significantly narrower exciton bandwidths in the presence of Hubbard physics, serving as a potential experimental signature of strong correlations. We also demonstrate the high tunability of Mott-moiré excitons through the dependence of their binding energies, diameters, and bandwidths on the moiré period. Our work provides guidelines for future exploration of strongly correlated excitons in twisted TMD heterobilayers.

References in corpus (66)

• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• 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
• Optical detection of Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices
• Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
• Topological insulators in twisted transition metal dichalcogenide homobilayers
• Hubbard model physics in transition metal dichalcogenide moiré bands
• Abundance of correlated insulating states at fractional fillings of WSe${}_2$/WS${}_2$ moiré superlattices
• Fermi polaron-polaritons in charge-tunable atomically thin semiconductors
• Intrinsic Exciton Linewidth in Monolayer Transition Metal Dichalcogenides
• Moiré heterostructures as a condensed matter quantum simulator
• Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
• Long range Neel order in the triangular Heisenberg model
• 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
• Topological Exciton Bands in Moiré Heterojunctions
• Anomalous Interlayer Exciton Diffusion in Twist-Angle-Dependent Moiré Potentials of WS${}_2$-WSe${}_2$ Heterobilayers
• Bright excitons in monolayer transition metal dichalcogenides: from Dirac cones to Dirac saddle points
• Neel order in square and triangular lattice Heisenberg models
• Revealing exciton masses and dielectric properties of monolayer semiconductors with high magnetic fields
• Exciton band structure of monolayer MoS2
• Continuous Mott transition in semiconductor moiré superlattices
• Direct Measurement of Exciton Valley Coherence in Monolayer WSe${}_2$
• Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
• Magneto-Optics of Exciton Rydberg States in a Monolayer Semiconductor
• Ground State and Hidden Symmetry of Magic Angle Graphene at Even Integer Filling
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Stripe phases in WSe2/WS2 moiré superlattices
• Strongly-Correlated Electron-Photon Systems
• Imaging moiré flat bands in 3D reconstructed WSe2/WS2 superlattices
• Band topology, Hubbard model, Heisenberg model, and Dzyaloshinskii-Moriya interaction in twisted bilayer WSe${}_2$
• Realization of an atomically thin mirror using monolayer MoSe2
• Effective spin model for the spin-liquid phase of the Hubbard model on the triangular lattice
• Moiré Potential Impedes Interlayer Exciton Diffusion in van der Waals Heterostructures
• Tunable bilayer Hubbard model physics in twisted WSe2
• Quantum Phase Diagram of a Moiré-Hubbard Model
• Hartree-Fock study of the moiré Hubbard model for twisted bilayer transition metal dichalcogenides
• Correlated interlayer exciton insulator in double layers of monolayer WSe2 and moiré WS2/WSe2
• Electronic structures, charge transfer and charge orders in twisted transition metal dichalcogenide bilayers
• Excitons in one-dimensional Mott insulators
• Fermion-Spin Transformation to Implement the Charge-Spin Separation
• Parton theory of magnetic polarons: Mesonic resonances and signatures in dynamics
• Optical excitations in a one-dimensional Mott insulator
• Shubnikov-de Haas oscillations in optical conductivity of monolayer MoSe${}_2$
• Coupling a mobile hole to an antiferromagnetic spin background: Transient dynamics of a magnetic polaron
• Charge Transfer Excitations, Pair Density Waves, and Superconductivity in Moiré Materials
• Microscopic spinon-chargon theory of magnetic polarons in the t-J model
• Exciton-polarons in doped semiconductors in a strong magnetic field
• Confinement-Deconfinement Transition as an Indication of Spin-Liquid-Type Behavior in Na${}_2$IrO${}_3$
• Competing magnetic states in transition metal dichalcogenide moiré materials
• Hole Spectral Function of a Chiral Spin Liquid in the Triangular Lattice Hubbard Model
• Spontaneous valley polarization of interacting carriers in a monolayer semiconductor
• Excitons in Mott insulators
• Moiré-induced optical non-linearities: Single and multi-photon resonances
• Spin-Mediated Mott Excitons
• Charge dynamics of the antiferromagnetically ordered Mott insulator
• The strong modulation limit of excitons and trions in moiré materials
• Composite boson many-body theory for Frenkel excitons
• Proposal for asymmetric photoemission and tunneling spectroscopies in quantum simulators of the triangular-lattice Fermi-Hubbard model
• Spin polarons in triangular antiferromagnets
• Doping a Mott insulator with excitons in moiré bilayer: fractional superfluid, neutral Fermi surface and Mott transition
• Superconductivity in Engineered Two-Dimensional Electron Gases
• Optical signatures of periodic magnetization: the moiré Zeeman effect
• Antiferromagnetic, metal-insulator, and superconducting phase transitions in underdoped cuprates: Slave-fermion t-J model in the hopping expansion
• The origin of exciton mass in a frustrated Mott insulator Na${}_2$IrO${}_3$
• Signature of electromagnetic quantum fluctuations in exciton physics

Cited by in corpus (10)

• Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré ${\mathrm{WS}}_2$/${\mathrm{WSe}}_2$ heterobilayer
• Polaron spectroscopy of interacting Fermi systems: insights from exact diagonalization
• Non-bosonic moiré excitons
• Collective optical properties of moiré excitons
• Exciton and light induced ferromagnetism from doping a moiré Mott insulator
• Exciton interacting with a moiré lattice: Polarons, strings, and optical probing of spin correlations
• Electrically tunable and enhanced nonlinearity of moiré exciton-polaritons in transition metal dichalcogenide bilayers
• Purely electronic model for exciton-polaron formation in moiré heterostructures
• Correlated phases of moat-band excitons in two dimensions
• Probing spatially resolved spin density correlations with trapped excitons