Greck Peter, Birner Stefan, Huber Bernhard, Vogl Peter
Opt Express. 2015 Mar 9;23(5):6587-600. doi: 10.1364/OE.23.006587.
We present a novel and very efficient method for calculating quantum transport in quantum cascade lasers (QCLs). It follows the nonequilibrium Green's function (NEGF) framework but sidesteps the calculation of lesser self-energies by replacing them by a quasi-equilibrium expression. This method generalizes the phenomenological Büttiker probe model by taking into account individual scattering mechanisms. It is orders of magnitude more efficient than a fully self-consistent NEGF calculation for realistic devices. We apply this method to a new THz QCL design which works up to 250 K - according to our calculations.
我们提出了一种新颖且高效的方法来计算量子级联激光器（QCL）中的量子输运。该方法遵循非平衡格林函数（NEGF）框架，但通过用准平衡表达式替代较小的自能来避免其计算。此方法通过考虑单个散射机制推广了唯象的布蒂克尔探针模型。对于实际器件，它比完全自洽的NEGF计算效率高几个数量级。我们将此方法应用于一种新的太赫兹QCL设计，根据我们的计算，该设计在高达250 K的温度下仍能工作。
