Topological nature of FeSe₀.₅Te₀.₅ superconductor
Wang, Zhijun · Zhang, P. · Xu, Gang · Zeng, L. K. · Miao, H. · Xu, Xiaoyan · Qian, T. · Weng, Hongming · Richard, P. · Fedorov, A. V. · Ding, H. · Dai, Xi · Fang, Zhong
Original · EN
We demonstrate, using first-principles calculations, that the electronic structure of FeSe₁₋ₓTeₓ (x=0.5) is topologically non-trivial, characterized by an odd Z₂ 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), 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 non-trivial superconducting channel in proximity to the bulk.
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