Dynamic interfacial polaron enhanced superconductivity of FeSe/SrTiO3

Abstract

The observation of substantially enhanced superconductivity of single-layer FeSe films on SrTiO3 has stimulated intensive research interest. At present, conclusive experimental data on the corresponding electron-boson interaction is still missing. Here we use inelastic electron scattering spectroscopy and angle resolved photoemission spectroscopy to show that the electrons in these systems are dressed by the strongly polarized lattice distortions of the SrTiO3, and the indispensable non-adiabatic nature of such a coupling leads to the formation of dynamic interfacial polarons. Furthermore, the collective motion of the polarons results in a polaronic plasmon mode, which is unambiguously correlated with the surface phonons of SrTiO3 in the presence of the FeSe films. A microscopic model is developed showing that the interfacial polaron-polaron interaction leads to the superconductivity enhancement.

arXiv comment13 pages, 3 figures

References in corpus (27)

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• Froehlich Polaron and Bipolaron: Recent Developments
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• Electric-field-induced superconductivity in electrochemically-etched ultrathin FeSe films on SrTiO3 and MgO
• 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
• Mobile small polaron
• Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
• Monolayer FeSe on SrTiO${}_3$
• Anomalous correlation effects and unique phase diagram of electron doped FeSe revealed by angle resolved photoemission spectroscopy
• Universal Substrate Effect on the Superconductivity of FeSe Monolayer Films
• Electric field-induced superconducting transition of insulating FeSe thin film at 35 K
• High-temperature superconductivity in single-unit-cell FeSe films on anatase TiO2(001)
• Ultrafast Dynamics Evidence of High Temperature Superconductivity in Single Unit Cell FeSe on SrTiO3
• The Role of SrTiO3 Phonon Penetrating into thin FeSe Films in the Enhancement of Superconductivity
• Froehlich-Coulomb model of high-temperature superconductivity and charge segregation in the cuprates
• High-temperature superconductivity in one-unit-cell FeSe films
• Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO${}_3$
• Interface high-temperature superconductivity
• Electron phonon coupling versus photoelectron energy loss at the origin of replica bands in photoemission of FeSe on SrTiO${}_3$
• 20 K superconductivity in heavily electron doped surface layer of FeSe bulk crystal
• Lattice Dynamics of Ultrathin FeSe Films on SrTiO3

Cited by in corpus (24)

• Antiferromagnetism induced by electron-phonon-coupling
• Robustness of Antiferromagnetism in the Su-Schrieffer-Heeger-Hubbard model
• Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface
• Ferroelectricity-tuned band topology and superconductivity in two-dimensional materials and related heterostructures
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• Direct observation of nodeless superconductivity and phonon modes in electron-doped copper oxide Sr${}_{1-x}$Nd${}_x$CuO${}_2$
• Chemistry of a light impurity in a Bose-Einstein condensate
• A functional renormalization group study of the two dimensional Su-Schrieffer-Heeger-Hubbard model
• Screening Induced Crossover between Phonon- and Plasmon-Mediated Pairing in Layered Superconductors
• Tuning the electronic states and superconductivity in alkali fulleride films
• Checkerboard order state in superconducting FeSe/SrTiO3(001) monolayer
• Superconductivity of the FeSe/SrTiO3 Interface in the View of BCS-BEC Crossover
• Electronic properties of the Dirac and Weyl systems with first- and higher-order dispersion in non-Fermi-liquid picture
• Revealing subterahertz atomic vibrations in quantum paraelectrics by surface-sensitive spintronic terahertz spectroscopy
• Robust d-wave superconductivity from the Su-Schrieffer-Heeger-Hubbard model: possible route to high-temperature superconductivity
• Direct observation of two-dimensional small polarons at correlated oxide interface
• Direct evidence of a charge depletion region at the interface of Van der Waals monolayers and dielectric oxides: The case of superconducting FeSe/STO
• Lateral quantum confinement effect on monolayer high-Tc superconductors
• Small polarons mediated near-room-temperature metal-insulator transition in vanadium dioxide and their hopping dynamics
• LaO as a candidate substrate for realizing superconductivity in FeSe epitaxial film
• Composite polaron formed on surface of two-dimensional lattice system in weak coupling regime
• Interfacial Polarons Driven by Charge Transfer In WSe2/Cuprate Superconductor Systems
• Merohedral disorder and impurity impacts on superconductivity of fullerenes
• Temperature evolution of the Fermi surface of the FeSe monolayer on SrTiO${}_3$