Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré / heterobilayer
arXiv:2304.09731 · doi:10.1038/s41467-024-46616-x
Abstract
Understanding the Hubbard model is crucial for investigating various quantum many-body states and its fermionic and bosonic versions have been largely realized separately. Recently, transition metal dichalcogenides heterobilayers have emerged as a promising platform for simulating the rich physics of the Hubbard model. In this work, we explore the interplay between fermionic and bosonic populations, using a / heterobilayer device that hosts this hybrid particle density. We independently tune the fermionic and bosonic populations by electronic doping and optical injection of electron-hole pairs, respectively. This enables us to form strongly interacting excitons that are manifested in a large energy gap in the photoluminescence spectrum. The incompressibility of excitons is further corroborated by measuring exciton diffusion, which remains constant upon increasing pumping intensity, as opposed to the expected behavior of a weakly interacting gas of bosons, suggesting the formation of a bosonic Mott insulator. We explain our observations using a two-band model including phase space filling. Our system provides a controllable approach to the exploration of quantum many-body effects in the generalized Bose-Fermi-Hubbard model.
Main text: 7 pages, 5 figures. Supplementary Material: 10 pages, 7 figures
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- Chiral Flat-Band Optical Cavity with Atomically Thin Mirrors
- Time-Domain Signatures of Distinct Correlated Insulators in a Moiré Superlattice
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- Exciton and light induced ferromagnetism from doping a moiré Mott insulator
- Collective optical properties of moiré excitons
- Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
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- Tuning transport in solid-state Bose-Fermi mixtures by Feshbach resonances
- Insulator phases of Bose-Fermi mixtures induced by intraspecies next-neighbor interactions
- Probing Quantum Anomalous Hall States in Twisted Bilayer WSe2 via Attractive Polaron Spectroscopy
- Magnetic and nematic order of Bose-Fermi mixtures in moiré superlattices of 2D semiconductors
- Exciton-Anyon Binding in Fractional Chern Insulators: Spectral Fingerprints
- A solvable model for strongly interacting nonequilibrium excitons
- Correlated phases of moat-band excitons in two dimensions
- Effective long-range attraction of moiré excitons under the influence of atomic reconstructions and anisotropic screening