The Spex code
Spex is an independent program and part of the Jülich FLAPW code family.
It gives access to theoretical spectra and quasiparticle properties employing TDDFT and the GW approximation. As it is based on the all-electron FLAPW method, a large variety of materials can be treated. The code was written with a focus on computational efficiency and ease of use.
Spex is written and maintained by Christoph Friedrich. Contributions by Manfred Niesert, Ersoy Sasioglu, Mathias Müller, Markus Betzinger, Stefan Rost, Anoop Chandran.
Financial support from the Deutsche Forschungsgemeinschaft through the Priority Programm 1145 "Modern and universal first-principles methods for many-electron systems in chemistry and physics" is gratefully acknowledged.
For further questions about Spex contact Christoph Friedrich.