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The coexistence of the charge-density wave (CDW) and superconducting phasesand their tunability under external pressure remains one of the key points inunderstanding the electronic structure of $A$V$_3$Sb$_5$ ($A$ = K, Rb, Cs)kagome metals. Here, we employ synchrotron-based infrared spectroscopy assistedby density-functional calculations to study the pressure evolution of theelectronic structure at room temperature up to 17 GPa experimentally. Theoptical spectrum of CsV$_3$Sb$_5$ is characterized by the presence of localizedcarriers seen as a broad peak at finite frequencies in addition to theconventional metallic Drude response. The pressure dependence of thislow-energy peak reflects the re-entrant behavior of superconductivity and maybe interpreted in terms of electron-phonon coupling, varying with the growthand shrinkage of the Fermi surface. Moreover, drastic modifications in thelow-energy interband absorptions are observed upon the suppression of CDW.These changes are related to the upward shift of the Sb2 $p_x+p_y$ band thateliminates part of the Fermi surface around the $M$-point, whereas band saddlepoints do not move significantly. These observations shed new light on themixed electronic and lattice origin of the CDW in CsV$_3$Sb$_5$.

Pressure evolution of electron dynamics in the superconducting kagome metal CsV$_3$Sb$_5$