A library of exchange-correlation functionals for density-functional theory
Libxc is a library of exchange and correlation functionals. Its purpose is to be used in codes that implement density-functional theory. For the moment, the library includes most of the local density approximations (LDAs), generalized density approximation (GGAs), and meta-GGAs. The library provides values for the energy density and its 1st, 2nd, and (for the LDAs) 3rd derivatives.