Terahertz quantum cascade structures using double longitudinal-optical phonon intrawell scattering for depopulation are theoretically studied. A density matrix Monte Carlo method is used to calculate the temperature dependent optical power, in double phonon structures with diagonal optical transitions. It is shown that using depopulation transitions greater than the resonant longitudinal-optical phonon energy ΔE > ℏω_LO reduces the phonon absorption thermal backscatter, allowing for higher operating temperatures, with prospects for 300 K room temperature and beyond. Furthermore, results indicate that the temperature limit may also be improved in single phonon structures, by similarly increasing the depopulation transition.

中文翻译：

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双纵向光学声子井内人口减少的太赫兹量子级联结构：使用密度矩阵方法的电子传输建模

理论上研究了使用双纵向光学声子井内散射来减少种群的太赫兹量子级联结构。密度矩阵蒙特卡罗方法用于计算具有对角光跃迁的双声子结构中的温度相关光功率。结果表明，使用大于谐振纵向光学声子能量 Δ E  > ℏ ω _{LO 的}人口减少跃迁减少了声子吸收热反向散射，允许更高的工作温度，并有望在 300 K 室温及更高温度下工作。此外，结果表明，单声子结构中的温度限制也可以通过类似地增加人口减少转变来提高。