Ubiquitous strong electron phonon coupling at the interface of FeSe/SrTiO3

Abstract

The high temperature superconductivity in single-unit-cell (1UC) FeSe on SrTiO3 (STO)(001) and the observation of replica bands by angle-resolved photoemission spectroscopy (ARPES) have led to the conjecture that the coupling between FeSe electron and the STO phonon is responsible for the enhancement of Tc over other FeSe-based superconductors1,2. However the recent observation of a similar superconducting gap in FeSe grown on the (110) surface of STO raises the question of whether a similar mechanism applies3,4. Here we report the ARPES study of the electronic structure of FeSe grown on STO(110). Similar to the results in FeSe/STO(001), clear replica bands are observed. We also present a comparative study of STO (001) and STO(110) bare surfaces, where photo doping generates metallic surface states. Similar replica bands separating from the main band by approximately the same energy are observed, indicating this coupling is a generic feature of the STO surfaces and interfaces. Our findings suggest that the large superconducting gaps observed in FeSe films grown on two different STO surface terminations are likely enhanced by a common coupling between FeSe electrons and STO phonons.

arXiv comment12 pages, 4 figures

References in corpus (26)

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• Critical role of substrate in the high temperature superconductivity of single layer FeSe on Nb:BaTiO${}_3$
• Tailoring the nature and strength of electron-phonon interactions in the SrTiO${}_3$(001) two-dimensional electron liquid
• Distinct Fermi Surface Topology and Nodeless Superconducting Gap in (Tl0.58Rb0.42)Fe1.72Se2 Superconductor
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3(110)
• Anomalous correlation effects and unique phase diagram of electron doped FeSe revealed by angle resolved photoemission spectroscopy
• Enhanced superconductivity and evidence for novel pairing in single-layer FeSe on SrTiO3 thin film under large tensile strain
• Anisotropic two-dimensional electron gas at SrTiO3(110) protected by its native overlayer
• Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
• Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
• High-temperature superconductivity in single-unit-cell FeSe films on anatase TiO2(001)
• Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb doped SrTiO3 substrate
• Electron pairing in the presence of incipient bands in iron-based superconductors
• Phase diagram of (Li1-xFex)OHFeSe: a bridge between iron selenide and arsenide superconductors
• Interface enhanced electron-phonon coupling and high temperature superconductivity in potassium-coated ultra-thin FeSe films on SrTiO3
• Observation of high-Tc superconductivity in rectangular FeSe/STO(110) monolayer
• Strong energy-momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO${}_3$
• Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3
• 20 K superconductivity in heavily electron doped surface layer of FeSe bulk crystal
• Simultaneous emergence of superconductivity, inter-pocket scattering and nematic fluctuation in potassium-coated FeSe superconductor
• Staggered FeSe Monolayer on SrTiO${}_3$ (110) surface

Cited by in corpus (37)

• Direct determination of mode-projected electron-phonon coupling in the time-domain
• Type-II Ising superconductivity in two-dimensional materials with strong spin-orbit coupling
• Strong Inter-valley Electron-Phonon Coupling in Magic-Angle Twisted Bilayer Graphene
• Electron phonon coupling versus photoelectron energy loss at the origin of replica bands in photoemission of FeSe on SrTiO${}_3$
• Evolution of spin excitations from bulk to monolayer FeSe
• Pairing Mechanism in Hunds Metal Superconductors and the Universality of the Superconducting Gap to Critical Temperature Ratio
• Full-bandwidth Eliashberg theory of superconductivity beyond Migdal's approximation
• Demonstration of resonant inelastic X-ray scattering as a probe of exciton-phonon coupling
• Dichotomy of superconductivity between monolayer FeS and FeSe
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• Interfacial Electron-Phonon Coupling Constants Extracted from Intrinsic Replica Bands in Monolayer FeSe/SrTiO${}_3$
• Unconventional pairing in single FeSe layers
• Self-consistent temperature dependence of quasiparticle bands in monolayer FeSe on SrTiO${}_3$
• Spin Fluctuation Induced Linear Magnetoresistance in Ultrathin Superconducting FeSe Films
• Increased Performance of Matsubara space calculations: A case study within Eliashberg theory
• Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates
• Dichotomy of the Photo Induced 2-Dimensional Electron Gas on SrTiO${}_3$ Surface Terminations
• Non-universal current flow near the metal-insulator transition in an oxide interface
• Direct probing of a large spin-orbit coupling in the FeSe superconducting monolayer on STO: Evidence for nontrivial topological states
• Screening Induced Crossover between Phonon- and Plasmon-Mediated Pairing in Layered Superconductors
• Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates
• Preliminary Tc calculations for iron-based superconductivity in NaFeAs, LiFeAs, FeSe and nanostructured FeSe/SrTiO3 Superconductors
• Non-perturbative Green's function method to determine the electronic spectral function due to electron-phonon interactions: Application to a graphene model from weak to strong coupling
• Direct Visualization and Manipulation of Tunable Quantum Well State in Semiconducting Nb2SiTe4
• Flat bands and temperature-driven phase transition in quasi-one-dimensional zigzag chains
• Manifestations of the electron-phonon interaction range in angle resolved photoemission spectra
• Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Interface suppressed nematicity and enhanced superconductivity of FeSe/NdFeO3 in the low doping regime
• Phonon Induced Instabilities in Correlated Electron Hamiltonians
• Modulation doping of the FeSe monolayer on SrTiO${}_3$
• Direct evidence of a charge depletion region at the interface of Van der Waals monolayers and dielectric oxides: The case of superconducting FeSe/STO
• The antiferromagnetic and phonon-mediated model of the NaFeAs, LiFeAs and FeSe superconductors
• The interactions between antiferromagnetism, tetrahedral sites and electron-phonon coupling in FeSe1-xTex and FeSe/SrTiO3
• The influence of antiferromagnetism, soft out-of plane phonons and heavy electrons on the superconducting pairing mechanism of Ba1-xKxFe2As2
• Temperature evolution of the Fermi surface of the FeSe monolayer on SrTiO${}_3$
• Superconductor-Insulator transition in a two-orbital attractive Hubbard model with Hund's exchange