Electronic structure of a Bi2Te3/FeTe heterostructure: Implications for unconventional superconductivity

Kenta Owada, Kosuke Nakayama, Ryuji Tsubono, Koshin Shigekawa, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We have performed angle-resolved photoemission spectroscopy on a heterostructure consisting of topological insulator Bi2Te3 and iron chalcogenide FeTe fabricated on SrTiO3 substrate by molecular-beam-epitaxy technique. This system was recently found to show the superconductivity albeit nonsuperconducting nature of each constituent material. Upon interfacing FeTe with two quintuple layers of Bi2Te3, we found that the Dirac-cone surface state of Bi2Te3 is shifted toward higher binding energy, while the holelike band at the Fermi level originating from FeTe moves toward lower binding energy. This suggests that electron charge transfer takes place from FeTe to Bi2Te3 through the interface. The present result points to the importance of hole-doped FeTe interface for the occurrence of unconventional superconductivity.

Original languageEnglish
Article number064518
JournalPhysical Review B
Issue number6
Publication statusPublished - 2019 Aug 21


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