Observation of topological transition in high-T${}_c$ superconductor FeTe${}_{1-x}$Se${}_x$/SrTiO${}_3$(001) monolayers

Abstract

Superconductors with topological surface or edge states have been intensively explored for the prospect of realizing Majorana bound states, which obey non-Abelian statistics and are crucial for topological quantum computation. The traditional routes for making topological insulator/superconductor and semiconductor/superconductor heterostructures suffer fabrication difficulties and can only work at low temperature. Here, we use angle-resolved photoemission spectroscopy to directly observe the evolution of a topological transition of band structure nearby the Fermi level in two-dimensional high-T${}_c$ superconductor FeTe${}_{1-x}$Se${}_x$/SrTiO${}_3$(001) monolayers, fully consistent with our theoretical calculations. Furthermore, evidence of edge states is revealed by scanning tunneling spectroscopy with assistance of theoretical calculations. Our study provides a simple and tunable platform for realizing and manipulating Majorana states at high temperature.

arXiv comment19 pages, 4 figures and 1 table

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• Observation of half-integer level shift of vortex bound states in an iron-based superconductor
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Topological and holonomic quantum computation based on second-order topological superconductors
• Boundary-obstructed topological high-T${}_c$ superconductivity in iron pnictides
• All-electrically tunable networks of Majorana bound states
• Intrinsic Time-reversal-invariant Topological Superconductivity in Thin Films of Iron-based Superconductors
• Magnetic, superconducting, and topological surface states on Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Vortex-line topology in iron-based superconductors with and without second-order topology
• High-$T_c$ Superconductor Fe(Se,Te) Monolayer: an Intrinsic, Scalable and Electrically-tunable Majorana Platform
• Competing Vortex Topologies in Iron-based Superconductors
• Band inversion and topology of the bulk electronic structure in FeSe${}_{0.45}$Te${}_{0.55}$
• Antiferromagnetism in two-dimensional materials: progress and computational challenges
• Phase-manipulation-induced Majorana Mode and Braiding Realization in Iron-based Superconductor Fe(Te,Se)
• Monolayer superconductivity and tunable topological electronic structure at the Fe(Te,Se)/Bi2Te3 interface
• Lattice distortion induced first and second order topological phase transition in rectangular high-T${}_{\mathrm{c}}$ superconducting monolayer
• Atomic line defects and topological superconductivity in unconventional superconductors
• Kondo interaction in FeTe and its potential role in the magnetic order
• Superconductivity at 40 K in lithiation-processed [(Fe,Al)(OH)2][FeSe]1.2 with a layered structure
• Observation of robust edge superconductivity in Fe(Se,Te) under strong magnetic perturbation
• Anisotropic gap structure and sign reversal symmetry in monolayer Fe(Se,Te)
• Moire Superlattice Modulations in Single-Unit-Cell FeTe Films Grown on NbSe2 Single Crystals
• Superconductor Vortex Spectrum Including Fermi Arc States in Time-Reversal Symmetric Weyl Semimetals
• Fe${}_{1+y}$Te${}_x$Se${}_{1-x}$: a delicate and tunable Majorana material
• Pomeranchuk instability in the nematic phase of two monolayer FeSe/SrTiO3