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cond-mat.stat-mech2026
Functional renormalization group in an external field: constant field versus constant order parameter
Julia von Rothkirch, Andreas Rückriegel, Peter Kopietz
Renormalization group (RG) flows for systems subject to an external field can be derived either by fixing the field or by fixing the conjugate order parameter. We show how to imple…
cond-mat.stat-mech2025
Functional renormalization group approach to phonon modified criticality: anomalous dimension of strain and non-analytic corrections to Hooke's law
Max O. Hansen, Julia von Rothkirch, Peter Kopietz
We study the interplay between critical isotropic elasticity and classical Ising criticality using a functional renormalization group (FRG) approach which is implemented such that…