Electronic Structure of Fe${}_{1.08}$Te bulk crystals and epitaxial FeTe thin films on Bi${}_2$Te${}_3$

Abstract

The electronic structure of thin films of FeTe grown on Bi${}_2$Te${}_3$ is investigated using angle-resolved photoemission spectroscopy, scanning tunneling microscopy and first principles calculations. As a comparison, data from cleaved bulk \FeTe taken under the same experimental conditions is also presented. Due to the substrate and thin film symmetry, FeTe thin films grow on Bi${}_2$Te${}_3$ in three domains, rotated by 0${}^{\circ }$, 120${}^{\circ }$, and 240${}^{\circ }$. This results in a superposition of photoemission intensity from the domains, complicating the analysis. However, by combining bulk and thin film data, it is possible to partly disentangle the contributions from three domains. We find a close similarity between thin film and bulk electronic structure and an overall good agreement with first principles calculations, assuming a p-doping shift of 65~meV for the bulk and a renormalization factor of around 2. By tracking the change of substrate electronic structure upon film growth, we find indications of an electron transfer from the FeTe film to the substrate. No significant change of the film's electronic structure or doping is observed when alkali atoms are dosed onto the surface. This is ascribed to the film's high density of states at the Fermi energy. This behavior is also supported by the ab-initio calculations.

References in corpus (27)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• High-temperature superconductivity in iron-based materials
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3
• A precise method for visualizing dispersive features in image plots
• Fermi surface topology and low-lying quasiparticle dynamics of parent Fe${}_{1+x}$Te/Se Superconductor by orbital-polarization resolved ARPES
• Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
• Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
• Doping Driven ($\pi ,0$) Nesting and Magnetic Properties of Fe${}_{1+x}$Te Superconductors
• Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
• Evidence for interfacial superconductivity in a bi-collinear antiferromagnetically ordered FeTe monolayer on a topological insulator
• Bulk Band Structure of Bi${}_2$Te${}_3$
• Extraordinary quasiparticle scattering and bandwidth-control by dopants in iron-based superconductors
• Strong correlation and massive spectral-weight redistribution induced spin density wave in a-Fe1.06Te
• 20 K superconductivity in heavily electron doped surface layer of FeSe bulk crystal
• Measurement of Coherent Polarons in the Strongly Coupled Antiferromagnetically Ordered Iron-Chalcogenide Fe1.02Te using Angle-Resolved Photoemission Spectroscopy
• Band gap engineering by Bi intercalation of graphene on Ir(111)
• Intra- and Interband Electron Scattering in the Complex Hybrid Topological Insulator Bismuth Bilayer on Bi${}_2$Se${}_3$
• Absence of superconductivity in ultra-thin layers of FeSe synthesized on a topological insulator
• Strongly anisotropic spin-orbit splitting in a two-dimensional electron gas
• Reversed anisotropy of the in-plane resistivity in the antiferromagnetic phase of iron tellurides
• Evidence for a two-fold symmetric superconducting gap in a monolayer of FeSe${}_{0.5}$Te${}_{0.5}$ on a topological insulator
• A flat band at the chemical potential of a Fe1.03Te0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy

Cited by in corpus (4)

• Monolayer superconductivity and tunable topological electronic structure at the Fe(Te,Se)/Bi2Te3 interface
• Step-edge assisted large scale FeSe monolayer growth on epitaxial Bi2Se3 thin films
• Enhanced spin ordering temperature in ultrathin FeTe films grown on a topological insulator
• Reversible tuning of magnetic order and intrinsic superconductivity in strained FeTe films via stoichiometry control