“… 52 − 54 In the GW approximation, 51 , 55 this expansion is truncated after first order, which accounts for the major part of electron correlation. 46 , 54 , 56 , 57 The GW approximation makes MBPT computationally tractable, greatly improves over DFT for the description of single-particle excitations, 46 , 53 , 58 and also paves the way toward accurate optical spectra using the Bethe-Salpeter equation formalism. 59 , 60 Large numbers of computational material science codes 48 , 56 , 61 − 72 feature GW implementations, and also in the quantum chemistry community, it has acquired some momentum over the last years.…”