Conventions
| BZ | Brilliouin Zone |
| RL | Reciprocal Lattice |
| LDA | Local Density Approximation |
| xc | exchange-correlation |
| KS | Kohn-Sham |
| QP | quasiparticle |
| DFT | Density Functional Theory |
| TDDFT | Time-Dependent DFT |
| MB(PT) | Many Body (Perturbation Theory) |
| LDA | Local Density Approximation |
| ALDA | Adiabatic LDA |
| XC | Exchange-Correlation |
| BS(K) | Bethe-Salpeter (Kernel) |