Topological nature of the FeSe0.5Te0.5 superconductor

Article

关键词: PHASE-DIAGRAM;    IRON;    FESE;   

DOI  :  10.1103/PhysRevB.92.115119

来源: SCIE

【 摘 要 】

We demonstrate, using first-principles calculations, that the electronic structure of FeSe1-xTex (x = 0.5) is topologically nontrivial and characterized by an odd Z(2) invariant and Dirac cone type surface states, in sharp contrast to the end member FeSe (x = 0). This topological state is induced by the enhanced three-dimensionality and spin-orbit coupling due to Te substitution (compared to FeSe), and characterized by a band inversion at the Z point of the Brillouin zone, which is confirmed by our ARPES measurements. The results suggest that the surface of FeSe0.5Te0.5 may support a nontrivial superconducting channel in proximity to the bulk.

【 授权许可】

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