  The kagome lattice of transition metal atoms provides an exciting platform to
study electronic correlations in the presence of geometric frustration and
nontrivial band topology, which continues to bear surprises. In this work,
using spectroscopic imaging scanning tunneling microscopy, we discover a
cascade of different symmetry-broken electronic states as a function of
temperature in a new kagome superconductor, CsV3Sb5. At a temperature far above
the superconducting transition Tc ~ 2.5 K, we reveal a tri-directional charge
order with a 2a0 period that breaks the translation symmetry of the lattice. As
the system is cooled down towards Tc, we observe a prominent V-shape spectral
gap opening at the Fermi level and an additional breaking of the six-fold
rotation symmetry, which persists through the superconducting transition. This
rotation symmetry breaking is observed as the emergence of an additional 4a0
unidirectional charge order and strongly anisotropic scattering in differential
conductance maps. The latter can be directly attributed to the
orbital-selective renormalization of the V kagome bands. Our experiments reveal
a complex landscape of electronic states that can co-exist on a kagome lattice,
and provide intriguing parallels to high-Tc superconductors and twisted bilayer
graphene.

Superconductivity;Strongly Correlated Electrons