We present a theory of the emission spectrum of magnetoexcitons interacting with a $\nu =1$ quantum Hall state of massive Dirac fermions in monolayer transition metal dichalcogenides in high magnetic fields. Using an ab initio–parametrized massive Dirac fermion model including valley and spin degrees of freedom, combined with exact diagonalization techniques, we show that interband emission from the massive Dirac fermion magnetoexciton interacting with $\nu =1$ state directly probes intra–conduction-band excitations of the $\nu =1$ state. Many-body interactions with the filled massive Dirac fermion $\nu =1$ level yield a strong renormalization of the emission spectrum, including fully polarized emission, a pronounced redshift, and broadening relative to neutral and charged excitons. The calculated spectra are consistent with recent experiments [Klein et al., Phys. Rev. Res. 3, L022009 (2021); Klein et al., Phys. Rev. B 105, L041302 (2022); and Oreszczuk et al., 2D Mater. 10, 045019 (2023)].

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• Excitons
• Hall effect
• High magnetic fields
• Landau levels
• Magneto-optics
• Optoelectronics
• Spin-orbit coupling
• Trions
• Valley degrees of freedom