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

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 nonsupercondu...

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Bibliographic Details
Published in:Physical review. B 2019-08, Vol.100 (6), p.1
Main Authors: Owada, Kenta, Nakayama, Kosuke, Tsubono, Ryuji, Shigekawa, Koshin, Sugawara, Katsuaki, Takahashi, Takashi, Sato, Takafumi
Format: Article
Language:English
Subjects:
Binding energy
Bismuth tellurides
Charge transfer
Electronic structure
Electrons
Heterostructures
Iron constituents
Photoelectric emission
Strontium titanates
Substrates
Unconventional superconductivity
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.064518