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

FeTe1−xSex is a family of iron-based superconductors with a well-known critical temperature (Tc) of 14.5 K for x = 0.45. Also well-established is the presence of topological surface states of FeTe0.55Se0.45 in which topological superconductivity sets in. By using density functional calculations and...

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Bibliographic Details
Published in:New journal of physics 2020-08, Vol.22 (8), p.083065
Main Authors: Yang, Chih-Kai, Lee, Chi-Hsuan
Format: Article
Language:English
Subjects:
BCS theory
Cooper pairs
exchange interaction
Exchanging
iron-based superconductor
Mathematical analysis
pairing mechanism
Physics
Superconductivity
Surface layers
topological superconductivity
Topology
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Summary:FeTe1−xSex is a family of iron-based superconductors with a well-known critical temperature (Tc) of 14.5 K for x = 0.45. Also well-established is the presence of topological surface states of FeTe0.55Se0.45 in which topological superconductivity sets in. By using density functional calculations and the Bardeen-Cooper-Schrieffer (BCS) theory for traditional superconductors we calculated the Tc of the surface layers of FeTe0.5Se0.5 with the exchange interaction as the source of attractive force to form the Cooper pairs. The estimated Tc is 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.
ISSN:1367-2630
DOI:10.1088/1367-2630/aba76e