Topological nature of FeSe$_{0.5}$Te$_{0.5}$ superconductor

By Zhijun Wang, Zhijun Wang, Peng Zhang, Gang Xu, L. Zeng, H. Miao, Xiao Yan Xu, T. Qian, H. Weng, P. Richard and 4 more. 2015

136 citations recorded by the source corpus.

We demonstrate, using first-principles calculations, that the electronic structure of FeSe$_{1-x}$Te$_{x}$ ($x$=0.5) is topologically non-trivial, characterized by an odd $\mathbb Z_2$ 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), 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 FeSe$_{0.5}$Te$_{0.5}$ may support a non-trivial superconducting channel in proximity to the bulk.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/a8d0748a37a406192f336676f036d9b68ab95163

Citations in the corpus

• Flat bands, strange metals and the Kondo effect (2023, unknown): “At low temperatures, a Kondo resonance with a width set by the Kondo temperature T K builds up at the Fermi energy as the local moments and conduction electrons form bound-state singlets 46 .”