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Systematic angle-resolved photoemission spectroscopy (ARPES) experiments havebeen carried out to investigate the bulk and (100) surface electronicstructures of a topological mixed-valence insulator candidate, YbB6. The bulkstates of YbB6 were probed with bulk-sensitive soft X-ray ARPES, which showstrong three-dimensionality as required by cubic symmetry. Surprisingly themeasured Yb 4f states are located around 1 eV and 2.3 eV below the Fermi level(EF), instead of being near EF as indicated by first principle calculations.The dispersive bands near EF are B 2p states, which hybridize with the 4fstates. Using surface-sensitive vacuum-ultraviolet ARPES, we revealedtwo-dimensional surface states which form three electron-like Fermi surfaces(FSs) with Dirac-cone-like dispersions. The odd number of surface FSs gives thefirst indication that YbB6 is a moderately correlated topological insulator.The spin-resolved ARPES measurements provide further evidence that thesesurface states are spin polarized with spin locked to the crystal momentum. Wehave observed a second set of surface states with different topology (hole-likepockets). Clear folding of the bands suggest their origin from a 1X2reconstructed surface. The topological property of the reconstructed surfacestates needs further studies.

Surface vs bulk electronic structures of a moderately correlated topological insulator YbB6 revealed by ARPES