Abstract
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.
Highlights
A detailed understanding of carrier dynamics is crucial for the design and improvement of modern semiconductor nanodevices such as quantum cascade lasers (QCLs)
We present a novel and very efficient method for calculating quantum transport in quantum cascade lasers (QCLs)
Our algorithm has been implemented into the nextnano.MSB software and allows finding an optimal QCL layout very quickly, as variations in alloy concentration, barrier thickness, and further parameters can be calculated in parallel
Summary
A detailed understanding of carrier dynamics is crucial for the design and improvement of modern semiconductor nanodevices such as QCLs. We present a novel and very efficient method for calculating quantum transport in quantum cascade lasers (QCLs). This method generalizes the phenomenological Büttiker probe model [1] but takes into account all relevant individual scattering mechanisms. It is orders of magnitude more efficient than a fully self-consistent NEGF calculation for realistic devices, yet accurately reproduces the results of the latter.
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