Charge transfer and electron-phonon coupling in monolayer FeSe on Nb doped SrTiO${}_3$

Abstract

Monolayer films of FeSe grown on SrTiO${}_3$ substrates are electron doped relative to bulk and exhibit a significantly higher superconducting transition temperatures. We present density functional calculations and a modified Schottky model incorporating the strong paraelectricity of SrTiO${}_3$ which demonstrate that the doping may be due to charge transfer from SrTiO${}_3$ impurity bands driven by work function mismatch. Physically relevant levels of Nb doping are shown to lead to doping of the FeSe compatible with observation. The coupling of electrons in FeSe to polar phonons in the depletion regime of the SrTiO${}_3$ is calculated. A $\lambda \sim 0.4$ is found; the coupling to long-wavelength phonons is found to be dominant.

arXiv comment8 pages, 4 figures

References in corpus (25)

• Conventional superconductivity at 203 K at high pressures
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Superconductivity in Iron Compounds
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Nematic order in iron superconductors - who is in the driver's seat?
• Strong electronic correlations from Hund's coupling
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Interface-induced superconductivity and strain-dependent spin density wave in FeSe/SrTiO3 thin films
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• Bi-collinear antiferromagnetic order in the tetragonal $\alpha$-FeTe
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor
• Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
• Efficient DMFT-simulation of the Holstein-Hubbard Model
• First-principles modeling of electrostatically doped perovskite systems
• Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates
• Large electron-phonon interactions from FeSe phonons in a monolayer
• Atomic and electronic structures of FeSe monolayer and bilayer thin films on SrTiO${}_3$ (001): a first-principles study
• Extraordinary quasiparticle scattering and bandwidth-control by dopants in iron-based superconductors
• Ab initio Study of Cross-Interface Electron-Phonon Couplings in FeSe Thin Films on SrTiO${}_3$ and BaTiO${}_3$
• Accumulation, inversion, and depletion layers in SrTiO${}_3$
• On peculiarities of superconductivity in the single-layer FeSe/SrTiO3 interfa
• Effect of the Wyckoff position of K atom on the crystal structure and electronic properties of KFe${}_2$Se${}_2$ compound

Cited by in corpus (26)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• The Role of SrTiO3 Phonon Penetrating into thin FeSe Films in the Enhancement of Superconductivity
• Superconductivity in FeSe thin films driven by the interplay between nematic fluctuations and spin-orbit coupling
• Electrochemical synthesis and crystal structure of the organic ion intercalated superconductor (TMA)0.5Fe2Se2 with Tc = 43 K
• Multiband full-bandwidth anisotropic Eliashberg theory of interfacial electron-phonon coupling and high-T${}_c$ superconductivity in FeSe/SrTiO${}_3$
• Dipolar phonons and electronic screening in monolayer FeSe on SrTiO${}_3$
• Phonon mediated superconductivity in low carrier-density systems
• Superfluid density and microwave conductivity of FeSe superconductor: ultra-long-lived quasiparticles and extended s-wave energy gap
• Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface
• Superconductivity without hole-pocket in electron-doped FeSe: Analysis beyond the Migdal-Eliashberg formalism
• Electronic structure of FeSe monolayer superconductors: shallow bands and correlations
• Electronic and phononic properties of a two dimensional electron gas coupled to dipolar phonons via small-momentum-transfer scattering
• Intrinsic interfacial van der Waals monolayers and their effect on the high-temperature superconductor FeSe/SrTiO${}_3$
• Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates
• Implicit renormalization approach to the problem of Cooper instability
• Multichannel superconductivity of monolayer FeSe on SrTiO${}_3$: Interplay of spin fluctuations and electron-phonon interaction
• Soft phonons in the interface layer of the STO substrate can explain high temperature superconductivity in one unit cell FeSe
• Direct probing of a large spin-orbit coupling in the FeSe superconducting monolayer on STO: Evidence for nontrivial topological states
• Superconductivity in the vicinity of a ferroelectric quantum phase transition
• Enhanced superconductivity in FeSe/SrTiO${}_3$ from the combination of forward scattering phonons and spin fluctuations
• Plain $s$-wave superconductivity near the magnetic criticality: Enhancement of attractive electron-boson coupling vertex corrections
• Kohn-Luttinger Correction to Tc in a Phonon Superconductor
• Electronic properties of the FeSe/STO interface from first-principle calculations
• Direct evidence of a charge depletion region at the interface of Van der Waals monolayers and dielectric oxides: The case of superconducting FeSe/STO
• Identifying a forward scattering superconductor through pump-probe spectroscopy
• Temperature evolution of the Fermi surface of the FeSe monolayer on SrTiO${}_3$