3 papers
cond-mat.str-el2025
Spontaneous magnon decay in two-dimensional altermagnets
Niklas Cichutek, Peter Kopietz, Andreas Rückriegel
We show that magnons in two-dimensional altermagnets can spontaneously decay at zero temperature. The decay rate is determined by quantum fluctuations and scattering processes invo…
cond-mat.str-el2025
Quantum fluctuations in two-dimensional altermagnets
Niklas Cichutek, Peter Kopietz, Andreas Rückriegel
The magnetic properties of two-dimensional altermagnets can be obtained from a square lattice Heisenberg model with antiferromagetic nearest neighbor interaction and two types of n…
cond-mat.str-el2024
Non-Fermi liquid fixed point of the dissipative Yukawa-Sachdev-Ye-Kitaev model
Niklas Cichutek, Andreas Rückriegel, Peter Kopietz
Using a functional renormalization group approach we derive the renormalization group (RG) flow of a dissipative variant of the Yukawa-Sachdev-Ye-Kitaev model describing fermio…