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Results for “moiré”
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Engineering the Band Topology in a Rhombohedral Trilayer Graphene Moiré Superlattice
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Nanoscale Optical Conductivity Imaging of Double-Moiré Twisted Bilayer Graphene
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Analysis of Strain and Defects in Tellurium-WSe 2 Moiré Heterostructures Using Scanning Nanodiffraction
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Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré WS 2 /WSe 2 heterobilayer
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 WS 2 /WSe 2 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 observing a suppression of exciton diffusion with increasing pump 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.
Time-domain signatures of distinct correlated insulators in a moiré superlattice
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Moiré band structure engineering using a twisted boron nitride substrate
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