  The diversity of emergent phenomena in quantum materials often arises from
the interplay between different physical energy scales or broken symmetries.
Cooperative interactions among them are rare; however, when they do occur, they
often stabilize fundamentally new ground states or phase behaviors. For
instance, a pair density wave can form when the superconducting order parameter
borrows spatial periodical variation from charge order; a topological
superconductor can arise when topologically nontrivial electronic states
proximitize with or participate in the formation of the superconducting
condensate. Here, we report spectroscopic evidence for a unique synergy of
topology and correlation effects in the kagome superconductor CsV$_3$Sb$_5$ -
one where topologically nontrivial surface states are pushed below the Fermi
energy (E$_F$) by charge order, making the topological physics active near
E$_F$ upon entering the superconducting state. Flat bands are observed,
indicating that electron correlation effects are also at play in this system.
Our results reveal the peculiar electronic structure of CsV$_3$Sb$_5$, which
holds the potential for realizing Majorana zero modes and anomalous
superconducting states in kagome lattices. They also establish CsV$_3$Sb$_5$ as
a unique platform for exploring the cooperation between the charge order,
topology, correlation effects and superconductivity.
