463 citations · 3k across the 44 of their papers we have counts for
4 papers · 1 filter
Fermion-boson vertex within Dynamical Mean-Field Theory
Erik G. C. P. van Loon, Friedrich Krien, Hartmut Hafermann +2
In the study of strongly interacting systems, correlations on the two-particle level are receiving more and more attention. In this work, we study a particular two-particle correla…
Second-order dual fermion approach to the Mott transition in the two-dimensional Hubbard model
Erik G. C. P. van Loon, Mikhail I. Katsnelson, Hartmut Hafermann
We apply the dual fermion approach with a second-order approximation to the self-energy to the Mott transition in the two-dimensional Hubbard model. The approximation captures nonl…
Increasing Achievable Information Rates via Geometric Shaping
Bin Chen, Chigo Okonkwo, Hartmut Hafermann +1
Achievable information rates are used as a metric to design novel modulation formats via geometric shaping. The proposed geometrically shaped 256-ary constellation achieves SNR gai…
Intersite electron correlations on inhomogeneous lattices: a real-space dual fermion approach
Nayuta Takemori, Akihisa Koga, Hartmut Hafermann
We develop a real-space extension of the dual fermion approach. This method is formulated in terms of real-space Green's functions and local vertex functions, which enables us to d…