358 citations · 1.8k across the 32 of their papers we have counts for
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Krylov-space approach to the equilibrium and the nonequilibrium single-particle Green's function
Matthias Balzer, Nadine Gdaniec, Michael Potthoff
The zero-temperature single-particle Green's function of correlated fermion models with moderately large Hilbert-space dimensions can be calculated by means of Krylov-space techniq…
Non-equilibrium cluster-perturbation theory
Matthias Balzer, Michael Potthoff
The cluster perturbation theory (CPT) is one of the simplest but systematic quantum cluster approaches to lattice models of strongly correlated electrons with local interactions. B…
Variational cluster approach to ferromagnetism in infinite dimensions and in one-dimensional chains
Matthias Balzer, Michael Potthoff
The variational cluster approach (VCA) is applied to study spontaneous ferromagnetism in the Hubbard model at zero temperature. We discuss several technical improvements of the num…
Importance of local correlations for the order parameter of high-Tc superconductors
Matthias Balzer, Werner Hanke, Michael Potthoff
It is shown that local temporal correlations in addition to non-local spatial correlations are important to understand the size and the doping dependence of the d-wave superconduct…
Mott transition in one dimension: Benchmarking dynamical cluster approaches
Matthias Balzer, Werner Hanke, Michael Potthoff
The variational cluster approach (VCA) is applied to the one-dimensional Hubbard model at zero temperature using clusters (chains) of up to ten sites with full diagonalization and…
Non-perturbative conserving approximations and Luttinger's sum rule
Jutta Ortloff, Matthias Balzer, Michael Potthoff
Weak-coupling conserving approximations can be constructed by truncations of the Luttinger-Ward functional and are well known as thermodynamically consistent approaches which respe…