Screening Induced Crossover between Phonon- and Plasmon-Mediated Pairing in Layered Superconductors

Abstract

Two-dimensional (2D) metals can host gapless plasmonic excitations, which strongly couple to electrons and thus may significantly affect superconductivity in layered materials. To investigate the dynamical interplay of the electron-electron and electron-phonon interactions in the theory of 2D superconductivity, we apply a full momentum- and frequency-dependent one-loop theory treating electron-phonon, electron-plasmon, and phonon-plasmon coupling with the same accuracy. We tune the strength of the Coulomb interaction by varying the external screening ${\epsilon }_{ext}$ to the layered superconductor and find three distinct regions. At weak screening, superconductivity is mediated by plasmons. In the opposite limit conventional electron-phonon interactions dominate. In between, we find a suppressed superconducting state. Our results show that even conventional electron-phonon mediated layered superconductors can be significantly affected by the electron-plasmon coupling in a weak screening environment. This unconventional pairing contribution can then be controlled by the external screening.

arXiv comment12 pages, 8 figures

References in corpus (37)

• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Electron-phonon interactions from first principles
• First-principles study of the phonon-limited mobility in n-type single-layer MoS2
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Evidence of Ising pairing in superconducting NbSe${}_2$ atomic layers
• TRIQS: A Toolbox for Research on Interacting Quantum Systems
• Quality heterostructures from two dimensional crystals unstable in air by their assembly in inert atmosphere
• Gate-induced Superconductivity in atomically thin MoS2 crystals
• Effect of dimensionality on the charge-density-wave in few-layers 2H-NbSe${}_2$
• The dielectric genome of van der Waals heterostructures
• Spin dynamics and an orbital-antiphase pairing symmetry in iron-based superconductors
• Superconductivity in Ca-doped graphene
• Unusual suppression of the superconducting energy gap and critical temperature in atomically thin NbSe2
• Electronic Collective Modes and Superconductivity in Layered Conductors
• Large electron-phonon interactions from FeSe phonons in a monolayer
• Ubiquitous strong electron phonon coupling at the interface of FeSe/SrTiO3
• Wannier Function Approach to Realistic Coulomb Interactions in Layered Materials and Heterostructures
• Dynamic interfacial polaron enhanced superconductivity of FeSe/SrTiO3
• Development of Density-Functional Theory for Plasmon-Assisted Superconducting State: Application to Lithium Under High Pressures
• Phase Diagram of Electron Doped Dichalcogenides
• Coexisting charge density wave and ferromagnetic instabilities in monolayer InSe
• Long-range electrostatic contribution to the electron-phonon couplings and mobilities of two-dimensional and bulk materials
• Ab initio theory of plasmonic superconductivity within the Eliashberg and density-functional formalisms
• Dipolar phonons and electronic screening in monolayer FeSe on SrTiO${}_3$
• Density Functional Theory for Plasmon-Assisted Superconductivity
• Two-dimensional plasmonic polarons in n-doped monolayer MoS2
• Phonon Self-Energy Corrections: To Screen, or Not to Screen
• Coulomb-Engineered Heterojunctions and Dynamical Screening in Transition Metal Dichalcogenide Monolayers
• Interplay of screening and superconductivity in low-dimensional materials
• Dynamical renormalization of electron-phonon coupling in conventional superconductors
• Interplay between band structure and Hund's correlation to increase T${}_c$ in FeSe
• Superconductivity in the Uniform Electron Gas: Irrelevance of Kohn-Luttinger Mechanism
• Origin of the Coulomb Pseudopotential
• Plasmon effect on the Coulomb pseudopotential ${\mu }^{\ast }$ in the McMillan equation
• Revisiting the homogeneous electron gas in pursuit of the properly normed ab initio Eliashberg theory
• Plasmonic Waveguides from Coulomb-Engineered Two-Dimensional Metals

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