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We have performed angle-resolved photoemission spectroscopy (ARPES) onCux(PbSe)5(Bi2Se3)6 (CPSBS; x = 1.47), a superconductor derived from atopological insulator heterostructure, to elucidate the electronic statesrelevant to the occurrence of possible unconventional superconductivity. UponCu intercalation into the parent compound (PbSe)5(Bi2Se3)6, we observed adistinct energy shift of the bulk conduction band due to electron doping.Photon-energy dependent ARPES measurements of CPSBS revealed that the observedbulk band forms a cylindrical electronlike Fermi surface at the Brillouin-zonecenter. The two-dimensional nature of the bulk electronic states suggests theoccurrence of odd-parity Eu pairing or even-parity d-wave pairing, both ofwhich may provide a platform of Majorana bound states in the superconductingstate.

physical review. b, condensed matter and materials physics

Observation of Two-Dimensional Bulk Electronic States in a  Superconducting Topological Insulator Heterostructure Cux(PbSe)5(Bi2Se3)6:  Implications for Unconventional Superconductivity