Hybridization between magneto-roton and moiré interband excitations in twisted MoTe2 creates an optically active exciton-roton mode with a characteristic roton minimum that is absent in continuum fractional quantum Hall systems.
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The authors derive an effective Hamiltonian for magnetoroton modes in moiré FQH and FCI systems via single-mode approximation and Monte Carlo three-point density correlations, predicting THz absorption trends and a soft-mode transition to CDW states.
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Exciton-roton mode in moir\'e fractional Chern insulators
Hybridization between magneto-roton and moiré interband excitations in twisted MoTe2 creates an optically active exciton-roton mode with a characteristic roton minimum that is absent in continuum fractional quantum Hall systems.
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Theory of magnetoroton bands in moir\'e materials
The authors derive an effective Hamiltonian for magnetoroton modes in moiré FQH and FCI systems via single-mode approximation and Monte Carlo three-point density correlations, predicting THz absorption trends and a soft-mode transition to CDW states.