Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 2: Correlated Electrons: Electronic Structure Calculations and Other Theoretical Topics
TT 2.13: Vortrag
Montag, 1. April 2019, 12:45–13:00, H7
Fluctuation effects at the onset of the 2kF density wave order in two-dimensional metals — •Jachym Sykora1, Tobias Holder2, and Walter Metzner1 — 1Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 2Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel 76100
We analyze quantum fluctuation effects at the onset of charge or spin density wave order in two-dimensional metals with an incommensurate 2kF wave vector. We distinguish two cases where the ordering vector connects either a single pair of hot spots on the Fermi surface or two pairs of hot spots. For both cases we evaluate the self-energy to leading order in fluctuation expansion (one loop). For the case of single pair of hot spots we find anomalous frequency scaling and a divergent renormalization of Fermi velocity. However this one loop result is found to not be self-consistent casting doubt on the existence of such a quantum critical point. The case of two pairs of hot spots also exhibits non-Fermi liquid behavior, however of a weaker kind and is the subject of current investigation.