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 (16)

• Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
• Moiré heterostructures as a condensed matter quantum simulator
• Exciton band structure of monolayer MoS2
• Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Strongly-Correlated Electron-Photon Systems
• 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
• Microscopic spinon-chargon theory of magnetic polarons in the t-J model
• Confinement-Deconfinement Transition as an Indication of Spin-Liquid-Type Behavior in Na${}_2$IrO${}_3$
• Spontaneous valley polarization of interacting carriers in a monolayer semiconductor
• Doping a Mott insulator with excitons in moiré bilayer: fractional superfluid, neutral Fermi surface and Mott transition
• Composite boson many-body theory for Frenkel excitons
• Superconductivity in Engineered Two-Dimensional Electron Gases
• Antiferromagnetic, metal-insulator, and superconducting phase transitions in underdoped cuprates: Slave-fermion t-J model in the hopping expansion
• 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