For bulk InSb at the quantum limit, it is shown that the lowering of the Landau levels is associated with excitation of excess electron-hole pairs by the action of the J x H force, when the stimulated emission sets out, and that the value of the gain of the emission becomes extremely high, diverging as w,i-m in accordance with the observation.Recent experiments carried out at the quantum limit [I-31 have revealed for the first time that stimulated interband Landau emission is brought about by the electromagnetic force (EMF) excitation with an outstanding low value of the critical current densities, such that J , = 16-40 A cm-', when a current J is passed through a bulk InSb plate subjected to a transverse, high magnetic field H up to 7T. The stimulated emissions, identified as a, and u2 emissions in figure 1, have been observed at temperatures from 4.2 to 135K a s long as the quantum limit condition hw,, > kT is satisfied, where w c , = eH/m,*c is the cyclotron frequency of electrons with the electric charge e and the effective mass in:, c is the light velocity, h is Planck's cunsiani, k is ihe Boltzmann constant, and T i s temperature (see reference
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