SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 47: Quantum-Critical Phenomena
TT 47.7: Talk
Thursday, March 30, 2023, 11:00–11:15, HSZ 204
Non-Fermi liquid behavior at flat hot spots at the onset of density wave order in two-dimensional metals — •Lukas Debbeler and Walter Metzner — Max Planck Institute for Solid State Research, Stuttgart, Germany
We analyze the quantum critical point (QCP) 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. From a theoretical point of view the fate of this QCP is debated. Strong fluctuations might lead to a discontinuously opening gap and therefore a first order transition [1]. On the other hand a fluctuation driven flattening at the hot spots of the Fermi surface has been found [2,3], which could protect the QCP. Hence, we investigate the effect of quantum critical fluctuations for a flat Fermi surface at the nesting points. We report non-Fermi liquid properties and provide numerical values for anomalous exponents.
[1] B. L. Altshuler et al., Phys. Rev. B 52, 5563 (1995)
[2] J. Sýkora et al., Phys. Rev. B 97, 155159 (2018)
[3] J. Halbinger et al., Phys. Rev. B 99, 195102 (2019)