  Recently discovered kagome superconductors AV3Sb5 (A = K, Rb, Cs) exhibit
exotic bulk and surface physical properties such as charge-density wave (CDW)
and chirality, whereas their origins remain unresolved. By using micro-focused
angle-resolved photoemission spectroscopy, we discovered that AV3Sb5 commonly
exhibits two distinct polar surfaces depending on the termination; electron-
and hole-doped ones for the A- and Sb-termination, respectively. We observed
that the kagome-derived band shows a clear splitting in the A-terminated
surface while it is absent in the Sb-terminated counterpart, indicative of the
polarity-dependent CDW at the surface. Close comparison of the band-dependent
splitting reveals that the three-dimensional CDW structure of the K-terminated
surface is different from that of the Rb- or Cs-terminated surface, suggesting
the diversity of the CDW ground state. These results provide important insight
into the origin of CDW in kagome superconductors AV3Sb5.
