103 citations · 423 across the 11 of their papers we have counts for
8 papers · 1 filter
A configuration interaction approach to solve the Anderson impurity model; applications to elemental Ce
Basile Herzog, Patrik Thunström, Olle Eriksson
Accurate calculations of strongly correlated materials remain a formidable challenge in condensed matter physics, particularly due to the computational demand of conventional metho…
Generic optical excitations of correlated systems: -tons
Anna Kauch, Petra Pudleiner, Katharina Astleithner +3
The interaction of light with solids gives rise to new bosonic quasiparticles, with the exciton being---undoubtedly---the most famous of these polaritons. While excitons are the ge…
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…
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…
Theory of -edge spectroscopy of strongly correlated systems
Johann Lüder, Johan Schött, Barbara Brena +6
X-ray absorption spectroscopy measured at the -edge of transition metals (TMs) is a powerful element-selective tool providing direct information about the correlation effects in…
Treatment of 4f states of the rare-earths: the case study of TbN
L. Peters, I. Di Marco, P. Thunström +3
The lattice constant, bulk modulus and shear constant of TbN are calculated by means of density functional theory (DFT) in the local density approximation (LDA) and generalized gra…
Dynamical vertex approximation in its parquet implementation: application to Hubbard nano-rings
A. Valli, T. Schäfer, P. Thunström +5
We have implemented the dynamical vertex approximation (DA) in its full parquet-based version to include spatial correlations on all length scales and in {\sl all} scattering ch…
Chebyshev expansion for Impurity Models using Matrix Product States
Martin Ganahl, Patrik Thunström, Frank Verstraete +2
We improve a recently developed expansion technique for calculating real frequency spectral functions of any one-dimensional model with short-range interactions, by postprocessing…