Evolution of the Fermi surface structure of the kagome superconductor CsV₃Sb₅ under pressure revealed by quantum oscillation

The Kagome lattice, naturally encompassing Dirac fermions, flat bands, and van Hove singularities, tends to intertwine exotic electronic states. The evolution of superconductivity and charge density wave under pressure in the kagome superconductor CsV₃Sb₅ is of particular interest. Here we report the evolution of Fermi surface properties in CsV₃Sb₅ by the Shubnikov de Haas oscillations under hydrostatic pressure up to 2 Gpa. We measured the magnetoresistance of high-quality samples at different angles to magnetic fields up to 14T. With increasing pressure, the transition temperature of the charge density wave decreases, the amplitude of the oscillations decreases, and the frequencies are significantly shifted, corresponding to a rapid change in the Fermi surface structure under pressure. The temperature dependence of the oscillation amplitude yields that the effective mass of each orbit increases with pressure. Our results demonstrate the evolution of the electronic structure along with charge density wave weakening and superconducting double dome behaviour under pressure from the perspective of quantum oscillations, which sheds new light on the further understanding of the interplay of multiple ordered states in CsV₃Sb_5.