Superradiance of nearly condensed excitons in InAs-GaSb coupled quantum wells

We suggest a system of ground state excitons in multiple InAs-GaSb coupled quantum wells as a new source of superradiance. Coupled InAs-GaSb quantum wells can be tuned to a very large wavelength that makes it possible to fabricate a sample with a large number of quantum wells radiating in phase, and in this way to increase the superradiant effect. Depending on the parameters of the system, this superradiance may be a direct analogy of the known Dicke case, or a realization of new type N-level superradiance. In the last case, the time dependence of the luminescence presents N decaying peaks. This dependence may be considered as a manifestation of transition to the Bose condensate phase.