Dipolar phonons and electronic screening in monolayer FeSe on SrTiO${}_3$

Abstract

Monolayer films of FeSe grown on SrTiO${}_3$ substrates exhibit significantly higher superconducting transition temperatures than those of bulk FeSe. Interaction of electrons in the FeSe layer with dipolar SrTiO${}_3$ phonons has been suggested as the cause of the enhanced transition temperature. In this paper we systematically study the coupling of SrTiO${}_3$ longitudinal optical phonons to the FeSe electron, including also electron-electron Coulomb interactions at the random phase approximation level. We find that the electron-phonon interaction between FeSe and SrTiO${}_3$ substrate is almost entirely screened by the electronic fluctuations in the FeSe monolayer, so that the net electron-phonon interaction is very weak and unlikely to lead to superconductivity.

arXiv comment8 pages, 8 figures

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Cited by in corpus (22)

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• Preformed Cooper pairs in layered FeSe-based superconductors
• Electron phonon coupling versus photoelectron energy loss at the origin of replica bands in photoemission of FeSe on SrTiO${}_3$
• Antiferromagnetism induced by electron-phonon-coupling
• Phonon mediated superconductivity in low carrier-density systems
• Robustness of Antiferromagnetism in the Su-Schrieffer-Heeger-Hubbard model
• Dichotomy of superconductivity between monolayer FeS and FeSe
• Lattice Dynamics of Ultrathin FeSe Films on SrTiO3
• Hund-enhanced electronic compressibility in FeSe and its correlation with T${}_c$
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• Electronic and phononic properties of a two dimensional electron gas coupled to dipolar phonons via small-momentum-transfer scattering
• 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
• Enhanced superconductivity in FeSe/SrTiO${}_3$ from the combination of forward scattering phonons and spin fluctuations
• Direct probing of a large spin-orbit coupling in the FeSe superconducting monolayer on STO: Evidence for nontrivial topological states
• Towards exact solutions for the superconducting $T_c$ induced by electron-phonon interaction
• Screening Induced Crossover between Phonon- and Plasmon-Mediated Pairing in Layered Superconductors
• Kohn-Luttinger Correction to Tc in a Phonon Superconductor
• Robust d-wave superconductivity from the Su-Schrieffer-Heeger-Hubbard model: possible route to high-temperature superconductivity
• 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${}_3$