Topological Characters in Fe(Te${}_{1-x}$Se${}_x$) thin films

Abstract

We investigate topological properties in the Fe(Te,Se) thin films. We find that the single layer FeTe${}_{1-x}$Se${}_x$ has nontrivial $Z_2$ topological invariance which originates from the parity exchange at $\Gamma$ point of Brillouin zone. The nontrivial topology is mainly controlled by the Te(Se) height. Adjusting the height, which can be realized as function of $x$ in FeTe${}_{1-x}$Se${}_x$, can drive a topological phase transition. In a bulk material, the two dimensional $Z_2$ topology invariance is extended to a strong three-dimensional one. In a thin film, we predict that the topological invariance oscillates with the number of layers. The results can also be applied to iron-pnictides. Our research establishes FeTe${}_{1-x}$Se${}_x$ as a unique system to integrate high T${}_c$ superconductivity and topological properties in a single electronic structure.

4.5 pages and 5 figures

References in corpus (14)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Topological Insulators with Inversion Symmetry
• One-dimensional Topological Edge States of Bismuth Bilayers
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Crystal structure of the new FeSe1-x superconductor
• Topological nature of FeSe${}_{0.5}$Te${}_{0.5}$ superconductor
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe${}_{1-x}$Te${}_x$ thin films
• Atomic and electronic structures of FeSe monolayer and bilayer thin films on SrTiO${}_3$ (001): a first-principles study
• Topological Phases in the Single-Layer FeSe
• Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO${}_3$
• Effects of charge doping and constrained magnetization on the electronic structure of an FeSe monolayer
• CaFeAs${}_2$: a Staggered Intercalation of Quantum Spin Hall and High Temperature Superconductivity
• Observation of an electron band above the Fermi level in FeTe${}_{0.55}$Se${}_{0.45}$ from \emph{in-situ} surface doping

Cited by in corpus (97)

• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Evidence for Majorana bound state in an iron-based superconductor
• Observation of topological superconductivity on the surface of an iron-based superconductor
• Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)
• Angle-resolved photoemission spectroscopy and its application to topological materials
• Topological superconductivity on the surface of Fe-based superconductors
• Multiple topological states in iron-based superconductors
• Kagome superconductors AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Observation of half-integer level shift of vortex bound states in an iron-based superconductor
• Signature of Dispersing 1D Majorana Channels in an Iron-based Superconductor
• Higher Order Topology and Nodal Topological Superconductivity in Fe(Se,Te) Heterostructures
• Helical Hinge Majoranas in Iron-Based Superconductors
• Exotic Superconducting States in FeSe-based Materials
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Probing topological quantum matter with scanning tunnelling microscopy
• Ordered and tunable Majorana-zero-mode lattice in naturally strained LiFeAs
• Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayer
• Topological and holonomic quantum computation based on second-order topological superconductors
• Tunable vortex Majorana zero modes in LiFeAs superconductor
• FeTe${}_{1-x}$Se${}_x$ monolayer films: towards the realization of high-temperature connate topological superconductivity
• Topological quantum states of matter in iron-based superconductors: From concepts to material realization
• Boundary-obstructed topological high-T${}_c$ superconductivity in iron pnictides
• All-electrically tunable networks of Majorana bound states
• Quantum anomalous vortex and Majorana zero mode in iron-based superconductor Fe(Te,Se)
• Exploring Topological Superconductivity in Topological Materials
• 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${}_x$
• Superconductivity across Lifshitz transition and anomalous insulating state in surface K-dosed (Li0.8Fe0.2OH)FeSe
• Observation of topological transition in high-T${}_c$ superconductor FeTe${}_{1-x}$Se${}_x$/SrTiO${}_3$(001) monolayers
• Detection of second-order topological superconductors by Josephson junctions
• Kramers pairs of Majorana corner states in a topological insulator bilayer
• Zero-energy bound states in the high-temperature superconductors at the two-dimensional limit
• Higher-order topological superconductors based on weak topological insulators
• Vortex-line topology in iron-based superconductors with and without second-order topology
• Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor ${\mathrm{FeTe}}_{0.55}{\mathrm{Se}}_{0.45}$
• High-$T_c$ Superconductor Fe(Se,Te) Monolayer: an Intrinsic, Scalable and Electrically-tunable Majorana Platform
• Competing Vortex Topologies in Iron-based Superconductors
• Creating Majorana modes from segmented Fermi surface
• Topological orders competing for the Dirac surface state in FeSeTe surfaces
• Spin-Orbital-Intertwined Nematic State in FeSe
• Edge states at nematic domain walls in FeSe films
• Topological Vortex Phase Transitions in Iron-Based Superconductors
• Noise signatures for determining chiral Majorana fermion modes
• Phase-manipulation-induced Majorana Mode and Braiding Realization in Iron-based Superconductor Fe(Te,Se)
• Pairing symmetry and topological surface state in iron-chalcogenide superconductors
• Tunable vortex Majorana modes controlled by strain in homogeneous LiFeAs
• Multiple Chiral Majorana Fermion Modes and Quantum Transport
• Correlation-corrected band topology and topological surface states in iron-based superconductors
• Emergent vortex Majorana zero mode in iron-based superconductors
• Boundary Topological Superconductors
• Topological properties of Mo${}_2$C and W${}_2$C superconductors
• Monolayer superconductivity and tunable topological electronic structure at the Fe(Te,Se)/Bi2Te3 interface
• Topological insulators in the NaCaBi family with large SOC gaps
• Experimental evidence of anomalously large superconducting gap on topological surface state of $\beta$-$\mathbf{B}{\mathbf{i}}_2\mathbf{Pd}$ film
• Atomic line defects and topological superconductivity in unconventional superconductors
• Optical vortex manipulation for topological quantum computation
• Lattice distortion induced first and second order topological phase transition in rectangular high-T${}_{\mathrm{c}}$ superconducting monolayer
• Topological Crystalline Superconductivity in Dirac Semimetal Phase of Iron-based Superconductors
• Origin of Topological Surface Superconductivity in FeSe${}_{0.45}$Te${}_{0.55}$
• Vortex Lattice Structure and Topological Superconductivity in the Quantum Hall Regime
• Twisted-bilayer FeSe and the Fe-based superlattices
• Design strong anomalous Hall effect via spin canting in antiferromagnetic nodal line materials
• Twofold symmetry of proximity-induced superconductivity in Bi${}_2$Te${}_3$/Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ heterostructures revealed by scanning tunneling microscopy
• Observation of robust edge superconductivity in Fe(Se,Te) under strong magnetic perturbation
• Topological superconductivity in Landau levels
• Strongly correlated superconductor with polytypic 3D Dirac points
• Direct observation of quantum anomalous vortex in Fe(Se,Te)
• Topological phase in non-centrosymmetric material NaSnBi
• Rotational symmetry breaking and partial Majorana corner states in a high-Tc superconductor based heterostructure
• Prediction of Double-Weyl Points in the Iron-Based Superconductor CaKFe${}_4$As${}_4$
• Interacting Valley Chern Insulator and its Topological Imprint on Moiré Superconductors
• Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in $A$V${}_3$Sb${}_5$ ($A=\text{K, Rb, Cs}$)
• Electronic Structure of Fe${}_{1.08}$Te bulk crystals and epitaxial FeTe thin films on Bi${}_2$Te${}_3$
• Tomonaga Luttinger liquid in the topological edge channel of multilayer FeSe
• Searching for Majorana quasiparticles at vortex cores in iron-based superconductors
• Bulk superconductivity in FeTe${}_{1-x}$Se${}_x$ via physicochemical pumping of excess iron
• Stoichiometric FeTe is a Superconductor
• Ferromagnetic Impurity Induced Majorana Zero Mode in Iron-Based Superconductor
• Competing topological superconducting phases in FeSe${}_{0.45}$Te${}_{0.55}$
• Controllable Majorana fermions on domain walls of a magnetic topological insulator
• Semimetallic spin-density wave state in iron pnictides
• Evidence for a robust sign-changing s-wave order parameter in monolayer films of superconducting Fe (Se,Te)/Bi2Te3
• Anisotropic gap structure and sign reversal symmetry in monolayer Fe(Se,Te)
• On the signatures of non-topological patches on the surface of topological insulators
• Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates
• Band Engineering of Dirac cones in Iron Chalcogenides
• Double Majorana Vortex Flat Bands in the Topological Dirac Superconductor
• Staggered FeSe Monolayer on SrTiO${}_3$ (110) surface
• Moire Superlattice Modulations in Single-Unit-Cell FeTe Films Grown on NbSe2 Single Crystals
• Theory of the Little-Parks effect in spin-triplet superconductors
• Identifying Majorana Zero Modes in Vortex Lattices Using Fano Factor Tomography
• Majorana Zero Modes and Topological Nature in Bi2Ta3S6-family Superconductors
• Majorana Flat Bands in the Vortex Line of Superconducting Weyl Semimetals
• Fermi-surface diagnosis for topological superconductivity with $s$-wave-like pairing symmetries
• Intrinsic chiral topological superconductor thin films
• Evolution of the intertwining correlated topological phases in iron-based superconductor Fe(Te,Se)
• Reversible tuning of magnetic order and intrinsic superconductivity in strained FeTe films via stoichiometry control