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

Abstract

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.

8 pages, 7 figures, 3 tables

References in corpus (18)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Superconductivity at 27 K in tetragonal FeSe under high pressure
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Tellurium substitution effect on superconductivity of the alpha-phase Iron Selenide
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• Correlated electronic structure of LaOFeAs
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Doping-dependent Phase Diagram of LaO{\it M}As ({\it M}=V--Cu) and Electron-type Superconductivity near Ferromagnetic Instability
• Simplified topological invariants for interacting insulators
• Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Rb) Superconductors
• Neutron scattering Measurements of the phonon density of states of FeSe${}_{1-x}$ superconductors
• High Temperature Superconductivity in Transition Metal Oxypnictides: a Rare-Earth Puzzle?
• Observation of an electron band above the Fermi level in FeTe${}_{0.55}$Se${}_{0.45}$ from \emph{in-situ} surface doping
• Se content $x$ dependence of electron correlation strength in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$

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