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In a superlattice placed in crossed electric and magnetic fields, undercertain conditions, the inversion of electron population can appear at whichthe average energy of electrons is above the middle of the miniband and theeffective mass of the electron is negative. This is the implementation of thenegative effective mass amplifier and generator (NEMAG) in the superlattice. Itcan result in the amplification and generation of terahertz radiation even inthe absence of negative differential conductivity.

Physical Principles of the Amplification of Electromagnetic Radiation Due to Negative Electron Masses in a Semiconductor Superlattice