Mode superradiance of free electron-hole pairs in semiconductor magnetooptics

An efficient mode regime of recombination superradiance in semiconductor magnetooptics, i.e., a collective spontaneous emission through interband recombination of free electrons and holes in a magnetized direct-gap semiconductor, is analyzed. The threshold conditions for this mode superradiance and a nonlinear solution to the Maxwell-Bloch semiconductor equations are found analytically for a microwave sample in any-Q Fabry-Perot cavity. It is shown that the dynamics and profile of recombination superradiance are different from those of usual superradiance in a two-level medium. The limiting parameters of coherent powerful pulses of recombination superradiance and the optimal reflection factor of an open Fabry-Perot cavity are established. Macroscopic quantum fluctuations of the delay time of spontaneously generated ultrashort pulses are described analytically for any number of transverse modes in a semiconductor sample.