Fermi surface nesting and the Lindhard response function in the kagome superconductor CsV3Sb5

The recently discovered kagome net compounds AV3Sb5 (A = K, Rb, and Cs) become superconducting on cooling, in addition to displaying interesting topological features the electronic structure. They also exhibit charge density wave ordering, which manifests as a breathing-mode distortion layers. It has been suggested that such ordering derives from nesting between saddle points Fermi surface. In aid of evolving understanding this intriguing materials class, we present calculations surface Lindhard susceptibility CsV3Sb5. breathing mode distortions appear not display simple link with (FSN) do signatures Peierls-like transition. FSN is agnostic changes along kz only mildly impacted by small shifts level. results suggest largely independent specific point.