论文标题
量子级联激光器中光子驱动传输的密度 - 矩阵模型
Density-matrix model for photon-driven transport in quantum cascade lasers
论文作者
论文摘要
我们开发了一个时间依赖性的密度 - 矩阵模型，以研究量子级联激光器中的光子辅助（PA）电子传输。在存在光场的存在下，密度矩阵的马尔可夫运动方程式用于任意场振幅。从微观的哈密顿人出现了水平的术语，并取代了经常在相关方法中使用的经验参数。我们表明，在具有对角线设计的量子级联激光器中，光子谐振对周围和上方的电子动力学具有明显的影响，这种效果源于上和下激光态之间的大空间分离。随着PA隧道的包含，计算出的电流密度和输出功率与实验非常吻合。
We developed a time-dependent density-matrix model to study photon-assisted (PA) electron transport in quantum cascade lasers. The Markovian equation of motion for the density matrix in the presence of an optical field is solved for an arbitrary field amplitude. Level-broadening terms emerge from microscopic Hamiltonians and supplant the need for empirical parameters that are often employed in related approaches. We show that, in quantum cascade lasers with diagonal design, photon resonances have a pronounced impact on electron dynamics around and above the lasing threshold, an effect that stems from the large spatial separation between the upper and lower lasing states. With the inclusion of PA tunneling, the calculated current density and output power are in good agreement with experiment.
