量子级联激光器的密度矩阵建模：广义散射方法
Density Matrix Modeling of Quantum Cascade Lasers without an Artificially Localized Basis: A Generalized Scattering Approach
摘要：
我们推导了量子级联激光器的密度矩阵理论，通过广义散射超算符描述了散射对相干性的影响。该理论使定量建模QCL，包括本地化和隧道效应，使用定义良好的能量本征态，而不是临时本地化的基础状态所需的大多数以前的DM模型。我们的微观散射方法也消除了现象学过渡或退相速率的需要。我们讨论的物理解释和数值实现的理论，提出了一套能量分辨和热平均方程，可用于详细或紧凑的设备建模。我们通过模拟一个高性能的谐振声子太赫兹（THz）QCL设计，不能很容易或准确地使用传统的DM方法建模，说明了理论的应用。我们表明，该理论的列入相干性是至关重要的描述本地化和隧道效应与实验一致。
英文摘要：
We derive a density matrix (DM) theory for quantum cascade lasers (QCLs) that describes the influence of scattering on coherences through a generalized scattering superoperator. The theory enables quantitative modeling of QCLs, including localization and tunneling effects, using the well-defined energy eigenstates rather than the ad hoc localized basis states required by most previous DM models. Our microscopic approach to scattering also eliminates the need for phenomenological transition or dephasing rates. We discuss the physical interpretation and numerical implementation of the theory, presenting sets of both energy-resolved and thermally averaged equations which can be used for detailed or compact device modeling. We illustrate the theory's applications by simulating a high performance resonant-phonon terahertz (THz) QCL design which cannot be easily or accurately modeled using conventional DM methods. We show that the theory's inclusion of coherences is crucial for describing localization and tunneling effects consistent with experiment.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
