  Quasi-two-dimensional kagome metals AV3Sb5 (A = Cs, Rb, and Cs) have
attracted much recent interest due to fascinating quantum phenomena such as
giant anomalous Hall effect, topological charge order, and unconventional
superconductivity. Here we report pressure-induced reemergent superconductivity
in CsV3Sb5 by electrical transport measurements under high pressures up to 47.9
GPa. We show that the superconducting critical temperature Tc is first enhanced
by pressure and reaches its first maximum ~ 8.9 K at 0.8 GPa, then the Tc is
suppressed by pressure and cannot be detected above 7.5 GPa, forming a
dome-shaped superconducting phase diagram. Remarkably, upon further compression
above 16.5 GPa, a new superconducting state arises, of which Tc is enhanced by
pressure to a second maximum ~ 5.0 K and the reemergent superconductivity keeps
robust up to 47.9 GPa. Combined with synchrotron x-ray diffraction measurements
that demonstrate the stability of the pristine hexagonal phase up to 43.1 GPa,
we argue that the reemergence of superconductivity in the V-based
superconductor could be attributed to a pressure-induced Lifshitz transition.
