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TT: Fachverband Tiefe Temperaturen

TT 39: Correlated Electrons: Charge Order

TT 39.2: Vortrag

Mittwoch, 20. März 2024, 09:45–10:00, H 3025

Kohn-Luttinger-like mechanism for charge density waves — •Hannes Braun — Max Planck Institute for Solid State Research, Stuttgart, Germany

We propose a Kohn-Luttinger-like mechanism for charge density waves with higher angular momentum in correlated electron systems. The mechanism describes an instability in the particle-hole direct channel, which emerges due to the feedback from the particle-hole crossed channel. Like in the original Kohn-Luttinger mechanism for superconductivity, the separation of vertex corrections in different lattice harmonics is the key for getting attractive components out of an initially repulsive interaction. We provide numerical as well as analytical arguments for the realisation of this mechanism in the triangular lattice Hubbard model with higher SU(N) symmetry, which can be implemented, e.g., in cold atomic gases or moiré bilayers of transition metal dichalcogenides.

Keywords: Kohn Luttinger; Charge Density Waves; Patch Model; Triangular lattice Hubbard model