Observation of an electron band above the Fermi level in FeTe${}_{0.55}$Se${}_{0.45}$ from \emph{in-situ} surface doping

Abstract

We used \emph{in-situ} potassium (K) evaporation to dope the surface of the iron-based superconductor FeTe${}_{0.55}$Se${}_{0.45}$. The systematic study of the bands near the Fermi level confirms that electrons are doped into the system, allowing us to tune the Fermi level of this material and to access otherwise unoccupied electronic states. In particular, we observe an electron band located above the Fermi level before doping that shares similarities with a small three-dimensional pocket observed in the cousin, heavily-electron-doped KFe${}_{2-x}$Se${}_2$ compound.

arXiv comment4 pages, 3 figures. Figures 1 and 2 modified

References in corpus (24)

• First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3, demonstration of Topological-Order at 300K and a realization of topological-transport-regime
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Interface-induced superconductivity and strain-dependent spin density wave in FeSe/SrTiO3 thin films
• A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
• Bi-collinear antiferromagnetic order in the tetragonal $\alpha$-FeTe
• Distinct Fermi Surface Topology and Nodeless Superconducting Gap in (Tl0.58Rb0.42)Fe1.72Se2 Superconductor
• Fe-based superconductors: an angle-resolved photoemission spectroscopy perspective
• Shallow pockets and very strong coupling superconductivity in FeSe_xTe_1-x
• Enhanced superconductivity and evidence for novel pairing in single-layer FeSe on SrTiO3 thin film under large tensile strain
• Strong nodeless pairing on separate electron Fermi surface sheets in (Tl, K)Fe${}_{1.78}$Se${}_2$ probed by ARPES
• Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45
• Local antiferromagnetic exchange and collaborative Fermi surface as key ingredients of high temperature superconductors
• Loss of nodal quasiparticle integrity in underdoped YBa2Cu3O6+x
• Electronic structure of Fe1.04(Te0.66Se0.34)
• Spin waves in the $(\pi ,0)$ magnetically ordered iron chalcogenide Fe${}_{1.05}$Te
• Superconductivity in an electron band just above the Fermi level: possible route to BCS-BEC superconductivity
• Spin Waves and magnetic exchange interactions in insulating Rb${}_{0.89}$Fe${}_{1.58}$Se${}_2$
• Electron-Hole Asymmetry in Superconductivity of Pnictides Originated from the Observed Rigid Chemical Potential Shift
• Orbital Characters Determined from Fermi Surface Intensity Patterns using Angle-Resolved Photoemission Spectroscopy
• Three-dimensionality and orbital characters of Fermi surface in (Tl,Rb)${}_y$Fe${}_{2-x}$Se${}_2$
• Observation of an isotropic superconducting gap at the Brillouin zone center of Tl${}_{0.63}$K${}_{0.37}$Fe${}_{1.78}$Se${}_2$
• A flat band at the chemical potential of a Fe1.03Te0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy

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• FeTe${}_{1-x}$Se${}_x$ monolayer films: towards the realization of high-temperature connate topological superconductivity
• FeTe${}_{0.55}$Se${}_{0.45}$: a multiband superconductor in the clean and dirty limit
• Polarity-dependent charge-density wave in a kagome superconductor CsV3Sb5
• Emergent vortex Majorana zero mode in iron-based superconductors
• Disentangling the surface and bulk electronic structures of LaOFeAs
• Alkali-metal induced band structure deformation investigated by angle-resolved photoemission spectroscopy and first-principles calculations
• Surface valence transition in SmS by alkali metal adsorption