Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.20: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Fluctuation effects at the onset of 2kF density wave order with one pair of hot spots 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 connecting a single pair of hot spots on the Fermi surface. We compute the momentum and frequency dependence of the fermion self-energy near the hot spots to leading order in a fluctuation expansion (one loop). Non-Fermi liquid behavior with anomalous frequency scaling, a vanishing quasi-particle weight, and a logarithmically divergent renormalization of the Fermi velocity are obtained. Going beyond the leading order calculation we find that the one-loop result is not self-consistent. Moreover, we show that any self-energy with a non-Fermi liquid frequency exponent wipes out the peak of the polarization function at the 2kF wave vector, and thus destroys the mechanism favoring 2kF density waves over those with generic wave vectors.