21 citations · 21 across the 1 of their papers we have counts for
11 papers
Computing local multipoint correlators using the numerical renormalization group
Seung-Sup B. Lee, Fabian B. Kugler, Jan von Delft
Local three- and four-point correlators yield important insight into strongly correlated systems and have many applications. However, the nonperturbative, accurate computation of m…
Multipoint correlation functions: spectral representation and numerical evaluation
Fabian B. Kugler, Seung-Sup B. Lee, Jan von Delft
The many-body problem is usually approached from one of two perspectives: the first originates from an action and is based on Feynman diagrams, the second is centered around a Hami…
Multiloop pseudofermion functional renormalization for quantum spin systems: Application to the spin- kagome Heisenberg model
Julian Thoenniss, Marc K. Ritter, Fabian B. Kugler +2
We present a multiloop pseudofermion functional renormalization group (pffRG) approach to quantum spin systems. As a test case, we study the spin- Heisenberg model on…
Quantitative functional renormalization-group description of the two-dimensional Hubbard model
Cornelia Hille, Fabian B. Kugler, Christian J. Eckhardt +5
Using a leading algorithmic implementation of the functional renormalization group (fRG) for interacting fermions on two-dimensional lattices, we provide a detailed analysis of its…
Strongly correlated materials from a numerical renormalization group perspective: How the Fermi-liquid state of SrRuO emerges
Fabian B. Kugler, Manuel Zingl, Hugo U. R. Strand +3
The crossover from fluctuating atomic constituents to a collective state as one lowers temperature or energy is at the heart of the dynamical mean-field theory description of the s…
Orbital differentiation in Hund metals
Fabian B. Kugler, Seung-Sup B. Lee, Andreas Weichselbaum +2
Orbital differentiation is a common theme in multiorbital systems, yet a complete understanding of it is still missing. Here, we consider a minimal model for orbital differentiatio…