标题： 电磁辐射在半导体超晶格中由于负电子质量而放大的物理原理 显示英文标题

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

摘要： 在超晶格置于交叉电场和磁场中时，在某些条件下，电子布居的反转可能出现，此时电子的平均能量高于亚带中间，并且电子的有效质量为负。 这是超晶格中负有效质量放大器和发生器（NEMAG）的实现。 即使不存在负微分电导，它也能导致太赫兹辐射的放大和产生。 显示英文摘要

摘要： In a superlattice placed in crossed electric and magnetic fields, under certain conditions, the inversion of electron population can appear at which the average energy of electrons is above the middle of the miniband and the effective mass of the electron is negative. This is the implementation of the negative effective mass amplifier and generator (NEMAG) in the superlattice. It can result in the amplification and generation of terahertz radiation even in the absence of negative differential conductivity.