  Investigating the implications of interlayer coupling on superconductivity is
essential for comprehending the intrinsic mechanisms of high temperature
superconductors. Van der Waals heterojunctions have attracted extensive
research due to their exotic interlayer coupling. Here, we present a natural
heterojunction superconductor of 6R-TaS2 that demonstrates a double-dome of
superconductivity, in addition to, the reemergence of superconducting under
high pressures. Our first principles calculation shows that the first dome of
superconductivity in 6R-TaS2 can be attributed to changes in interlayer
coupling and charge transfer. The second superconducting dome and the
reemergence of superconductivity can be ascribed to changes in the density of
states resulting from Fermi surface reconstruction, in which the DOS of T-layer
and S p-orbitals play a crucial role. We have reported the first observation in
TMDs that non-metallic atoms playing a dominant role in the reemergence of
superconducting and the influence of two Lifshitz transitions on
superconducting properties.
