References
The implementation details of TB2J:
The theoretical background for exchanges calculation is described in
Initial idea of Green’s function method of calculating J.
Isotropic exchange using Maximally localized Wannier function.
Full exchange tensor.
Biqudratic term.
S. Lounis, P. H. Dederichs, Phys. Rev. B 82 180404(R) (2010)
- Downfold method