The recent discovered kagome superconductors provide a good platform for
studying intertwined orders and novel states such as topology, superconductor,
charge density wave, et al. The interplay of these orders may spontaneously
break the rotational symmetry, and induce exotic phenomena such as nematicity,
or even nematic superconductor. Here we report a two-fold rotational symmetric
superconductivity of thin-film RbV3Sb5 in response to a direction-dependent
in-plane magnetic fields, in contrast to the six-fold structural symmetry of
the crystal lattice. The two-fold symmetry was evidenced by the
magnetoresistance transport experiments, critical magnetic field measurements
and the anisotropic superconducting gap. With different configuration, we
further observed the six-fold symmetry superimposed on the two-fold symmetry
near the boundary between normal states and superconducting states. Our results
present the correlation-driven symmetry breaking and highlight the promising
platform to study the intertwined orders such as unconventional
superconductivity in this correlated kagome family