Excitation of long-lived triplet magnetoexcitons in a Hall insulator (filling factor nu=2) with a high mobility of electrons, at low temperatures, T<1 K, enabled to discover a new collective state - magnetofermionic condensate, that interacts coherently with an external electromagnetic field, exhibits superradiant properties and, owing to its low viscosity, spreads over the surface of the two-dimensional structure for macroscopically large distances. Acknowledgements We are grateful to S. Schmult (Max-Planck-Institut fur Festkorperforschung, Stuttgart, Germany) for providing us with high-quality heterostructures and to S.M. Dickmann for useful discussions. The work was partially supported by the Russian Foundation for Basic Research.

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