FeTe${}_{1-x}$Se${}_x$ monolayer films: towards the realization of high-temperature connate topological superconductivity

Abstract

We performed angle-resolved photoemission spectroscopy studies on a series of FeTe${}_{1-x}$Se${}_x$ monolayer films grown on SrTiO${}_3$. The superconductivity of the films is robust and rather insensitive to the variations of the band position and effective mass caused by the substitution of Se by Te. However, the band gap between the electron- and hole-like bands at the Brillouin zone center decreases towards band inversion and parity exchange, which drive the system to a nontrivial topological state predicted by theoretical calculations. Our results provide a clear experimental indication that the FeTe${}_{1-x}$Se${}_x$ monolayer materials are high-temperature connate topological superconductors in which band topology and superconductivity are integrated intrinsically.

arXiv comment14 pages, 4 figures

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• High-$T_c$ Superconductor Fe(Se,Te) Monolayer: an Intrinsic, Scalable and Electrically-tunable Majorana Platform
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• Positive and negative chemical pressure effects investigated in electron-doped FeSe films with an electric-double-layer structure
• Unveiling non-Abelian statistics of vortex Majorana bound states in iron-based superconductors using fermionic modes
• Evidence for a robust sign-changing s-wave order parameter in monolayer films of superconducting Fe (Se,Te)/Bi2Te3
• Moire Superlattice Modulations in Single-Unit-Cell FeTe Films Grown on NbSe2 Single Crystals
• Majorana Zero Modes and Topological Nature in Bi2Ta3S6-family Superconductors
• Superconductivity in centrosymmetric topological superconductor candidate TaC
• Spectroscopic evidence of disorder-induced quantum phase transitions in monolayer Fe(Te,Se) superconductor