Topological superconductivity facilitated by exchange interaction on the surface of FeTe0.5Se0.5

Chih Kai Yang, Chi Hsuan Lee

Research output: Contribution to journalJournal Article peer-review

2 Scopus citations


FeTe1-xSexis a family of iron-based superconductors with a well-known critical temperature (T c) of 14.5 K for x = 0.45. Also well-established is the presence of topological surface states of FeTe0.55Se0.45in which topological superconductivity sets in. By using density functional calculations and the Bardeen-Cooper-Schrieffer (BCS) theory for traditional superconductors we calculated the T cof the surface layers of FeTe0.5Se0.5with the exchange interaction as the source of attractive force to form the Cooper pairs. The estimated T cis in reasonable agreement with the experimental value and suggests that the exchange interaction is behind the topological superconductivity on the surface of FeTe0.55Se0.45

Original languageEnglish
Article number083065
JournalNew Journal of Physics
Issue number8
StatePublished - 08 2020
Externally publishedYes

Bibliographical note

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© 2020 Institute of Physics Publishing. All rights reserved.


  • Exchange interaction
  • Iron-based superconductor
  • Pairing mechanism
  • Topological superconductivity


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