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We study light emission properties of a population-inverted 2D electron-holeplasma in a quantizing magnetic field. We observe a series of superfluorescentbursts, discrete both in time and energy, corresponding to the cooperativerecombination of electron-hole pairs from different Landau levels. The emissionenergies are strongly renormalized due to many-body interactions among thephotogenerated carriers, exhibiting red-shifts as large as 20 meV at 15 T.However, the magnetic field dependence of the lowest Landau level emission lineremains excitonic at all magnetic fields. Interestingly, our time-resolvedmeasurements show that this lowest-energy burst occurs only after all upperstates become empty, suggesting that this excitonic stability is related to the`hidden symmetry' of 2D magneto-excitons expected in the magnetic quantumlimit.

Renormalized Energies of Superfluorescent Bursts from an Electron-Hole Magneto-plasma with High Gain in InGaAs Quantum Wells