187 citations · 341 across the 8 of their papers we have counts for
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Low energy singularities in the ground state of fermionic superfluids
Benjamin Obert, Christoph Husemann, Walter Metzner
We analyze the effects of order parameter fluctuations on the ground state of fully gapped charge-neutral fermionic superfluids. The Goldstone mode associated with the spontaneousl…
Incommensurate nematic fluctuations in the two-dimensional Hubbard model
Christoph Husemann, Walter Metzner
We analyze effective d-wave interactions in the two-dimensional extended Hubbard model at weak coupling and small to moderate doping. The interactions are computed from a renormali…
Frequency Dependent Vertex Functions of the (t,t')-Hubbard Model at Weak Coupling
Christoph Husemann, Kay-Uwe Giering, Manfred Salmhofer
We present a functional renormalization group calculation for the two-dimensional (t,t')-Hubbard model at Van Hove filling. Using a channel decomposition we describe the momentum a…
Smoothing of Singular Legendre Transforms in Renormalization Group Flows
Christoph Husemann, Manfred Salmhofer
We consider O(N)-symmetric potentials with a logarithmic singularity in the second field derivative. This class includes BCS and Gross Neveu potentials. Formally, the exact renorma…
Efficient Fermionic One-Loop RG for the 2D Hubbard Model at Van Hove Filling
Christoph Husemann, Manfred Salmhofer
We propose a novel parametrization of the four-point vertex function in the one-loop one-particle irreducible renormalization group (RG) scheme for fermions. It is based on a decom…
Efficient Parametrization of the Vertex Function, -Scheme, and the (t,t')-Hubbard Model at Van Hove Filling
Christoph Husemann, Manfred Salmhofer
We propose a new parametrization of the four-point vertex function in the one-loop one-particle irreducible renormalization group (RG) scheme for fermions. It is based on a decompo…