Excitons between moiré flat Chern bands acquire giant helical dipoles from Berry curvature, with displacement field driving a Frenkel-Wannier transition and formation of quadrupolar biexcitons.
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In the topological heavy fermion model, the Mott semimetal phase hosts well-defined quasiparticles with dispersion and relaxation rate proportional to the interaction strength.
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Giant and Helical Exciton Dipole from Berry Curvature in Flat Chern Bands
Excitons between moiré flat Chern bands acquire giant helical dipoles from Berry curvature, with displacement field driving a Frenkel-Wannier transition and formation of quadrupolar biexcitons.
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Lifetime and spectral function of topological heavy fermions
In the topological heavy fermion model, the Mott semimetal phase hosts well-defined quasiparticles with dispersion and relaxation rate proportional to the interaction strength.