Speaker
Hannes Braun
(MSFK)
Description
We propose a Kohn-Luttinger-like mechanism for charge density waves in correlated electron systems with higher symmetries SU(N).The mechanism is responsible for an instability with finite transfer momentum 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, the separation of momentum channels in different lattice harmonics is the key for getting attractive components out of an initially repulsive interaction. Using the truncated unity fRG we find evidence that this very mechanism produces an imaginary charge density wave in an SU(4)-invariant triangular lattice Hubbard model around Van Hove filling.
Primary authors
Hannes Braun
(MSFK)
Laura Classen
(MSFK)
