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This website describes the nextnano.NEGF software (previously called nextnano.QCL), a NEGF quantum transport code written by Thomas Grange. The nextnano.NEGF software has been developed to simulate electron dynamics in heterostructures like superlattices and quantum cascade lasers (QCLs). It can also be used to simulate absorption spectra in quantum wells (QWs) and transport in resonant tunneling diodes (RTDs).
The software calculates current-voltage characteristics and gain/absorption spectra.
This software is based on a quantum transport method that follows the nonequilibrium Green's function (NEGF) framework. The code can be executed using the nextnanomat software.
Please download it from here. Additionally, it is strongly recommend to contact support@nextnano.com and inform us that you are interested in this tool. We can then assist you and provide new updates to you.
Open the nextnanomat GUI, open a nextnano.NEGF input file and press the Run
button.
nextnano.NEGF.exe <input file name> <output folder name> <material database name> <License file name>
Example:
nextnano.NEGF.exe "..\nextnano.NEGF sample files\MidIR_QCL_YuSlivkenRazeghi_SST2010.xml" "..\Output" "..\Material_Database.xml" "..\License_nnQCL.lic"
Optional: the argument “–threads 2” can be appended to the command line to limit the number of threads to e.g. 2.
Further tutorials can be found here: Tutorials
The NEGF method for QCLs is decribed in the following publications where the nextnano.NEGF code was used.
A good introduction is also the tutorial talk Modeling electron transport in quantum cascade lasers given by Thomas Grange at the International Quantum Cascade Laser School and Workshop (Cassis/France, 2018).
The nextnano.NEGF software has been developed by Thomas Grange. It is written in C#. For publications of Thomas Grange, see his profile on Google Scholar.
The nextnano.NEGF software is distributed by the nextnano GmbH.
For questions or feedback about the software, please contact support@nextnano.com.