63 citations · 607 across the 21 of their papers we have counts for
4 papers · 1 filter
Fluctuation diagnostic of the nodal/antinodal dichotomy in the Hubbard model at weak coupling: a parquet dual fermion approach
Friedrich Krien, Alexander I. Lichtenstein, Georg Rohringer
We apply the boson exchange parquet solver for dual fermions to the half-filled Hubbard model on a square lattice at small interaction. Our results establish that, in this regime,…
Tiling with triangles: parquet and methods unified
Friedrich Krien, Anna Kauch, Karsten Held
The parquet formalism and Hedin's approach are unified into a single theory of vertex corrections, corresponding to an exact reformulation of the parquet equations in terms o…
Boson-Exchange Parquet Solver for dual fermions
Friedrich Krien, Angelo Valli, Patrick Chalupa +3
We present and implement a parquet approximation within the dual-fermion formalism based on a partial bosonization of the dual vertex function which substantially reduces the compu…
The Bethe-Salpeter equation at the critical end-point of the Mott transition
Erik G. C. P. van Loon, Friedrich Krien, Andrey A. Katanin
Strong repulsive interactions between electrons can lead to a Mott metal-insulator transition. The Dynamical Mean-Field Theory (DMFT) explains the critical end-point and hysteresis…