5 papers
Approaching Coupled Cluster Accuracy with Positive Semidefinite Vertex Corrected Self-Energies
Yaroslav Pavlyukh, Fabien Bruneval, Arno Förster
Hedin's formalism of functional derivatives is the best-known method for systematically constructing correlated electronic theories, largely due to the success of its lowest-order…
reduced density matrix from iterated linearized Dyson equation
Fabien Bruneval, Erik Verzijl, Arno Förster +1
Iterating the Dyson equation with the static part of the self-energy leads to a concise and possibly improved expression of the one-body reduced density matrix from any self-energy…
Abinit 2025: New Capabilities for the Predictive Modeling of Solids and Nanomaterials
Matthieu J. Verstraete, Joao Abreu, Guillaume E. Allemand +71
Abinit is a widely used scientific software package implementing density functional theory and many related functionalities for excited states and response properties. This paper p…
Time-Reversal Symmetry in RDMFT and pCCD with Complex-Valued Orbitals
Mauricio RodrÃguez-Mayorga, Pierre-François Loos, Fabien Bruneval +1
Reduced density matrix functional theory (RDMFT) and coupled cluster theory restricted to paired double excitations (pCCD) are emerging as efficient methodologies for accounting fo…
Why does the approximation give accurate quasiparticle energies? The cancellation of vertex corrections quantified
Arno Förster, Fabien Bruneval
Hedin's approximation to the electronic self-energy has been impressively successful to calculate quasiparticle energies, such as ionization potentials, electron affinities, o…