This work investigates the Fermi surface properties in the three-dimensional charge density wave (CDW) phase of CsV₃Sb₅. The authors derive Fermi-energy-resolved and layer-resolved quantum orbits that quantitatively agree with experiments. They reveal a complex Dirac nodal network contributing to the π Berry phase of quantum orbits, influenced by orbital moment and Zeeman effects alongside spin-orbital coupling (SOC). This allows for observation of topological quantum orbits with a π phase shift even in orbits that would be trivial without SOC.

Hengxin Tan, Yongkang Li, Yizhou Liu, Daniel Kaplan, Ziqiang Wang, Binghai Yan