37 citations · 37 across the 2 of their papers we have counts for
3 papers · 1 filter
Parquet approximation for molecules: spectrum and optical conductivity of the Pariser-Parr-Pople model
Petra Pudleiner, Patrik Thunström, Angelo Valli +3
We study a simple model system for the conjugated -bonds in benzene, the Pariser-Parr-Pople (PPP) model, within the parquet approximation (PA), exemplifying the prospects of the…
A systematic study of the local minima in L(S)DA+U
Samara Keshavarz, Patrik Thunström
We have performed a systematic study of the emergence of meta-stable states in density functional theory plus Hubbard U (DFT+U ) simulations of NiO, CoO, FeO. Particular attention…
Analytical investigation of singularities in two-particle irreducible vertex functions of the Hubbard atom
Patrik Thunström, Olle Gunnarsson, Sergio Ciuchi +1
Two-particle generalized susceptibilities and their irreducible vertex functions play a prominent role in the quantum many-body theory for correlated electron systems. They act as…