Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates

Abstract

We study the consequences of an electron-phonon ($e$-$ph$) interaction that is strongly peaked in the forward scattering ($\mathbf{q}=0$) direction in a two-dimensional superconductor using Migdal-Eliashberg theory. We find that strong forward scattering results in an enhanced $T_c$ that is linearly proportional to the strength of the dimensionless $e$-$ph$ coupling constant ${\lambda }_m$ in the weak coupling limit. This interaction also produces distinct replica bands in the single-particle spectral function, similar to those observed in recent angle-resolved photoemission experiments on FeSe monolayers on SrTiO${}_3$ and BaTiO${}_3$ substrates. By comparing our model to photoemission experiments, we infer an $e$-$ph$ coupling strength that can provide a significant portion of the observed high $T_c$ in these systems.

Main text 5 pages, 4 figures; and Supplementary Information

References in corpus (10)

• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Enhancement of superconductivity near a nematic quantum critical point
• Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunneling microscopy
• A Systematic Study of Electron-Phonon Coupling to Oxygen Modes Across the Cuprates
• Origin of the large phonon band-gap in SrTiO3 and the vibrational signatures of ferroelectricity in ATiO3 perovskite: First principles lattice dynamics and inelastic neutron scattering of PbTiO3, BaTiO3 and SrTiO3
• Atomic and electronic structures of FeSe monolayer and bilayer thin films on SrTiO${}_3$ (001): a first-principles study
• Two-gap superconductivity in heavily n-doped graphene: ab initio Migdal-Eliashberg theory
• Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO${}_3$
• Isotope effect and the role of phonon in the Fe-based superconductors
• Effects of phonon interaction on the pairing in the high-T$c$ superconductors

Cited by in corpus (80)

• Phonon-enhanced superconductivity at the FeSe/SrTiO3 interface
• Cavity Quantum Materials
• Monolayer FeSe on SrTiO${}_3$
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
• Universal Substrate Effect on the Superconductivity of FeSe Monolayer Films
• High-temperature superconductivity in single-unit-cell FeSe films on anatase TiO2(001)
• High-temperature superconductivity in one-unit-cell FeSe films
• Preformed Cooper pairs in layered FeSe-based superconductors
• Superconducting Properties of the $s^{\pm }$-wave state: Fe-based superconductors
• High Tc via spin fluctuations from incipient bands: application to monolayers and intercalates of FeSe
• Pairing in magic-angle twisted bilayer graphene: role of phonon and plasmon umklapp
• Superconductivity in FeSe thin films driven by the interplay between nematic fluctuations and spin-orbit coupling
• Electron phonon coupling versus photoelectron energy loss at the origin of replica bands in photoemission of FeSe on SrTiO${}_3$
• Ab initio Study of Cross-Interface Electron-Phonon Couplings in FeSe Thin Films on SrTiO${}_3$ and BaTiO${}_3$
• Charge transfer and electron-phonon coupling in monolayer FeSe on Nb doped SrTiO${}_3$
• Full-bandwidth Eliashberg theory of superconductivity beyond Migdal's approximation
• Multiband full-bandwidth anisotropic Eliashberg theory of interfacial electron-phonon coupling and high-T${}_c$ superconductivity in FeSe/SrTiO${}_3$
• Aspects of electron-phonon interactions with strong forward scattering in FeSe Thin Films on SrTiO${}_3$ substrates
• Dipolar phonons and electronic screening in monolayer FeSe on SrTiO${}_3$
• Phonon mediated superconductivity in low carrier-density systems
• Correlation of Fe-based Superconductivity and Electron-Phonon Coupling in an FeAs/Oxide Heterostructure
• Novel pairing mechanism for superconductivity at a vanishing level of doping driven by critical ferroelectric modes
• Dichotomy of superconductivity between monolayer FeS and FeSe
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Lattice Dynamics of Ultrathin FeSe Films on SrTiO3
• Superconductivity without hole-pocket in electron-doped FeSe: Analysis beyond the Migdal-Eliashberg formalism
• Hund-enhanced electronic compressibility in FeSe and its correlation with T${}_c$
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• The electron-phonon interaction with forward scattering peak is a relevant approach to high Tc superconductivity in FeSe films on SrTiO3 and TiO2
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• Amperean superconductivity cannot be induced by deep subwavelength cavities in a two-dimensional material
• Interfacial Electron-Phonon Coupling Constants Extracted from Intrinsic Replica Bands in Monolayer FeSe/SrTiO${}_3$
• Pairing Mechanism of the Heavily Electron Doped FeSe Systems: Dynamical Tuning of the Pairing Cutoff Energy
• Electronic structure of FeSe monolayer superconductors: shallow bands and correlations
• Self-consistent temperature dependence of quasiparticle bands in monolayer FeSe on SrTiO${}_3$
• Electronic and phononic properties of a two dimensional electron gas coupled to dipolar phonons via small-momentum-transfer scattering
• Bounds on Nanoscale Nematicity in Single-Layer FeSe/SrTiO${}_3$
• Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates
• Intrinsic interfacial van der Waals monolayers and their effect on the high-temperature superconductor FeSe/SrTiO${}_3$
• Implicit renormalization approach to the problem of Cooper instability
• On the origin of the shallow and "replica" bands in FeSe monolayer superconductors
• Phonon Boost Effect on the $S^{\pm }$-wave Superconductor with Incipient Band
• Band structure and charge doping effects of potassium-adsorbed FeSe/SrTiO3 system
• 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
• Towards exact solutions for the superconducting $T_c$ induced by electron-phonon interaction
• Controlling unconventional superconductivity in artificially engineered $f$-electron Kondo superlattices
• Enhanced superconductivity in FeSe/SrTiO${}_3$ from the combination of forward scattering phonons and spin fluctuations
• Electron - phonon coupling in Eliashberg - McMillan theory beyond adiabatic approximation
• Electron-plasmon interaction induced plasmonic-polaron band replication in epitaxial perovskite SrIrO${}_3$ films
• Plain $s$-wave superconductivity near the magnetic criticality: Enhancement of attractive electron-boson coupling vertex corrections
• Competing phases and orbital-selective behaviors in the two-orbital Hubbard-Holstein model
• Kohn-Luttinger Correction to Tc in a Phonon Superconductor
• Tuning the pairing interaction in a $d$-wave superconductor by paramagnons injected through interfaces
• Phase competition in a one-dimensional three-orbital Hubbard-Holstein model
• Influence of electron-phonon coupling strength on signatures of even and odd-frequency superconductivity
• Constraints on the total coupling strength to bosons in iron based superconductors
• Spectral properties and enhanced superconductivity in renormalized Migdal-Eliashberg theory
• Cascade of replica bands in flat band systems: predictions for twisted bilayer graphene
• Intrinsic charge dynamics in high-Tc AFeAs(O,F) superconductors
• Dispersionless orbital excitations in (Li,Fe)OHFeSe superconductors
• Nonperturbative self-consistent electron-phonon spectral functions and transport
• Optimal Boson energy for superconductivity in the Holstein model
• Domes of $T_c$ in single-band and multiband superconductors with finite-range attractive interactions
• Identifying the dominant pairing interaction in high-$T_c$ FeSe superconductors through Leggett modes
• Doping effects on electronic states in electron-doped FeSe: Impact of self-energy and vertex corrections
• The phonon mechanism explanation of the superconductivity dichotomy between FeSe and FeS monolayers on STO and other substrates
• Modification of magnetic fluctuations by interfacial interactions in artificially engineered heavy-fermion superlattices
• Charge correlations suppress unconventional pairing in the Holstein model
• Effects of the Hubbard interaction on the quantum metric
• Identifying a forward scattering superconductor through pump-probe spectroscopy
• Understanding and enhancing superconductivity in FeSe/STO by quantum size effects
• Many-body calculations of plasmon and phonon satellites in angle-resolved photoelectron spectra using the cumulant expansion approach
• Theoretical study of phonon-mediated superconductivity beyond Migdal-Eliashberg approximation and Coulomb pseudopotential
• Beyond-quasiparticle transport with vertex correction: self-consistent ladder formalism for electron-phonon interactions
• Inferior interfacial superconductivity in 1 UC FeSe/SrVO${}_3$/SrTiO${}_3$ with screened interfacial electron-phonon coupling
• The fate of the Fermi surface coupled to a single-wave-vector cavity mode
• Microscopic theory for electron-phonon coupling in twisted bilayer graphene
• Theory of Superconductivity Mediated by Topological Phonons