We investigate room-temperature lasing of terahertz quantum cascade lasers using quantum dot chains as active material suitable for wireless communication and imaging technologies. To make band structure calculations for such extended systems of coupled quantum dots possible, we developed a “linear combination of quantum dot orbitals” method, based on single quantum dot wave functions. Our results demonstrate strong vertical emission of coupled quantum dots, reduced phonon coupling, and in-plane scattering, enabling room-temperature lasing with significantly reduced threshold current densities.

中文翻译：

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室温太赫兹激光：基于量子点超晶格的垂直发射量子级联激光器的数值研究

我们研究使用量子点链作为适用于无线通信和成像技术的活性材料对太赫兹量子级联激光器进行室温激射。为了使这种耦合量子点扩展系统的能带结构计算成为可能，我们基于单个量子点波函数开发了“量子点轨道的线性组合”方法。我们的结果证明了耦合量子点的强垂直发射，降低的声子耦合和面内散射，从而使室温激射的阈值电流密度大大降低。