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We investigate photoluminescence from a high-density electron-hole plasma insemiconductor quantum wells created via intense femtosecond excitation in astrong perpendicular magnetic field, a fully-quantized and tunable system. At acritical magnetic field strength and excitation fluence, we observe a cleartransition in the band-edge photoluminescence from omnidirectional output to arandomly directed but highly collimated beam. In addition, changes in thelinewidth, carrier density, and magnetic field scaling of the PL spectralfeatures correlate precisely with the onset of random directionality,indicative of cooperative recombination from a high density population of freecarriers in a semiconductor environment

Cooperative Recombination of a Quantized High-Density Electron-Hole Plasma in Semiconductor Quantum Wells