463 citations · 3k across the 44 of their papers we have counts for
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cond-mat.str-el2008★ 126 cited
Efficient perturbation theory for quantum lattice models
H. Hafermann, G. Li, A. N. Rubtsov +3
We present a novel approach to long-range correlations beyond dynamical mean-field theory through a ladder approximation to dual fermions. The new technique is applied to the two-d…
cond-mat.str-el2008★ 52 cited
Superperturbation solver for quantum impurity models
Hartmut Hafermann, Christoph Jung, Sergey Brener +3
We present a very efficient solver for the general Anderson impurity problem. It is based on the perturbation around a solution obtained from exact diagonalization using a small nu…