89 citations · 788 across the 32 of their papers we have counts for
5 papers · 1 filter
RG transport theory for open quantum systems: Charge fluctuations in multilevel quantum dots in and out of equilibrium
Carsten J. Lindner, Fabian B. Kugler, Volker Meden +1
We present the real-time renormalization group (RTRG) method as a method to describe the stationary state current through generic multi-level quantum dots with a complex setup in n…
Counting Feynman diagrams via many-body relations
Fabian B. Kugler
We present an iterative algorithm to count Feynman diagrams via many-body relations. The algorithm allows us to count the number of diagrams of the exact solution for the general f…
Derivation of exact flow equations from the self-consistent parquet relations
Fabian B. Kugler, Jan von Delft
We exploit the parquet formalism to derive exact flow equations for the two-particle-reducible four-point vertices, the self-energy, and typical response functions, circumventing t…
Multiloop functional renormalization group for the two-dimensional Hubbard model: Loop convergence of the response functions
Agnese Tagliavini, Cornelia Hille, Fabian B. Kugler +3
We present a functional renormalization group (fRG) study of the two dimensional Hubbard model, performed with an algorithmic implementation which lifts some of the common approxim…
Flavor fluctuations in 3-level quantum dots: Generic SU(3)-Kondo fixed point in equilibrium and non-Kondo fixed points in nonequilibrium
Carsten J. Lindner, Fabian B. Kugler, Herbert Schoeller +1
We study a -level quantum dot in the singly occupied cotunneling regime coupled via a generic tunneling matrix to several multi-channel leads in equilibrium or nonequilibrium. W…