|DFTB+XT open software package for quantum nanoscale modeling|
DFTB+ eXTended version for model and atomistic quantum transport at nanoscale, many-body nonequilibrium phenomena, material & device modeling
DFTB+XT is an open source software package for
DFTB+XT is an extended version of the DFTB+ code.
DFTB+ and DFTB+XT is free and open software licensed under the GNU Lesser GPL version 3 or later.
DFTB+XT source code is based on the DFTB+ source code and LibNEGF source code (which itself is used in DFTB+ for transport calculations). Additionally, it suggests a number of new features, which are in the testing phase and may be included into the DFTB+ release later. The extended functionality of DFTB+XT is mainly focused on many-body quantum transport and applications in nanoscience, material and device modeling.
New featuresIn the current version of DFTB+XT we present the following new features.
We introduced the possibility to read model Hamiltonians from external data files and use it with or without a geometry structure. This is especially important for many-body quantum transport problems.
Two models of elastic dephasing ("Büttiker probe" and "vibronic dephasing") can be used now to include the dephasing and dissipation beyond the coherent Green function method. Thus, we made a new step towards realistic material and device modeling.
We added new options to simplify and make faster the calculation of currents for systems with changeable geometry (like the STM setup). We also supply the python scripts for modeling of the scanning process over tip position and voltage.
ContactDmitry A. Ryndyk