Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory
Strong electronic correlations pose one of the biggest challenges to solid state theory.
Recently developed methods that address this problem by starting with the local, eminently …
Recently developed methods that address this problem by starting with the local, eminently …
Tracking the footprints of spin fluctuations: A multimethod, multimessenger study of the two-dimensional Hubbard model
The Hubbard model represents the fundamental model for interacting quantum systems and
electronic correlations. Using the two-dimensional half-filled Hubbard model at weak …
electronic correlations. Using the two-dimensional half-filled Hubbard model at weak …
Correlated materials design: prospects and challenges
The design of correlated materials challenges researchers to combine the maturing, high
throughput framework of DFT-based materials design with the rapidly-develo** first …
throughput framework of DFT-based materials design with the rapidly-develo** first …
Attractive effect of a strong electronic repulsion: The physics of vertex divergences
While the breakdown of the perturbation expansion for the many-electron problem has
several formal consequences, here we unveil its physical effect: flip** the sign of the …
several formal consequences, here we unveil its physical effect: flip** the sign of the …
Nonlinear responses and three-particle correlators in correlated electron systems exemplified by the Anderson impurity model
Three-particle correlators are relevant for, among others, Raman, Hall, and nonlinear
responses. They are also required for the next order of approximations extending dynamical …
responses. They are also required for the next order of approximations extending dynamical …
Fulfillment of sum rules and Ward identities in the multiloop functional renormalization group solution of the Anderson impurity model
P Chalupa-Gantner, FB Kugler, C Hille, J von Delft… - Physical Review …, 2022 - APS
We investigate several fundamental characteristics of the multiloop functional
renormalization group (mfRG) flow by hands of its application to a prototypical many …
renormalization group (mfRG) flow by hands of its application to a prototypical many …
Collective modes in excitonic magnets: Dynamical mean-field study
We present a dynamical mean-field study of dynamical susceptibilities in the two-band
Hubbard model. Varying the model parameters we analyze the two-particle excitations in the …
Hubbard model. Varying the model parameters we analyze the two-particle excitations in the …
Effective Heisenberg model and exchange interaction for strongly correlated systems
We consider the extended Hubbard model and introduce a corresponding Heisenberg-like
problem written in terms of spin operators. The derived formalism is reminiscent of …
problem written in terms of spin operators. The derived formalism is reminiscent of …
Parquetlike equations for the Hedin three-leg vertex
Taking the competition and the mutual screening of various bosonic fluctuations in
correlated electron systems into account requires an unbiased approach to the many-body …
correlated electron systems into account requires an unbiased approach to the many-body …
Dynamical mean field theory extension to the nonequilibrium two-particle self-consistent approach
Nonlocal correlations play an essential role in correlated electron systems, especially in the
vicinity of phase transitions and crossovers, where two-particle correlation functions display …
vicinity of phase transitions and crossovers, where two-particle correlation functions display …