Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Correlated Electrons: Poster Session
TT 21.11: Poster
Mittwoch, 7. September 2022, 15:00–18:00, P1
Quantum criticality of 2kF density wave order in two-dimensional metals — •Lukas Debbeler and Walter Metzner — Max Planck Institute for Solid State Research
We analyze the quantum critical point at the transition towards incommensurate charge or spin density wave order with a 2kF wave vector that connects a single pair of hot spots on the Fermi surface. Perturbative renormalization group (RG) calculations confirm non-Fermi liquid behavior with anomalous frequency scaling and renormalization of the Fermi surface in proximity to the hot spots. Employing a functional RG approach we treat frequency and momentum dependence as well as fermionic and bosonic degrees of freedom on equal footing. This approach does not lead to a self consistent solution with a peak of the static polarization function at the 2kF-vector. We explore the possibility of a self consistent quantum critical solution via a scaling ansatz.