Abstract
We present a detailed analysis of GaAs/AlGaAs terahertz quantum cascade laser in the presence of anintense external magnetic field. One of the objectives in further development of THz quantum cascade laseris the realization of structures operating at higher temperatures. This is difficult to obtain as the operatingphoton emission energy is smaller than the longitudinal-optical phonon energy in the semiconductor material.With increased temperature, electrons in the upper radiative state gain sufficient in-plane energy to emit anlongitudinal-opticalphonon,whichrepresentsanon-radiativescatteringandreducestheopticalgain. Byapplyingstrong magnetic field, two-dimensional continuous energy subbands become split into series of discrete Landaulevels,andatparticularvaluesof
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