Eliashberg theory of the Jahn-Teller-Hubbard model
arXiv:2203.06946 · doi:10.1103/PhysRevB.105.214516
Abstract
We study a multiorbital Hubbard model coupled to local Jahn-Teller phonons to investigate the superconducting state realized in fullerides. A weak-coupling approach is employed in combination with a local self-energy approximation. In addition to the normal and anomalous self-energies of the electrons, we consider the phonon self-energy, which allows a self-consistent treatment of the energetics. The frequency dependence of the self-energies and their characteristic coefficients, such as renormalization factors and dampings, are investigated in detail using numerical calculations. It is clarified that the anisotropic phonons play an important role in the stabilization of the superconducting state. By comparing the full results to those without phonon self-energies, we show that the superconductivity is stabilized by the softening of the phonon frequency. The effects of electronic fluctuations are also considered, which leads to the coupling to orbitons, an analog of plasmons in the electron gas. This additional contribution further stabilizes the superconducting state.
arXiv comment15 pages, 9 figures
References in corpus (32)
- Superconductivity in Fullerides
- An optically stimulated superconducting-like phase in K3C60 far above equilibrium Tc
- Spontaneously polarized half-gapped superconductivity
- Unconventional Superconductivity in Heavy Fermion UTe2
- Strongly Correlated Superconductivity
- High temperature superconductivity in sulfur and selenium hydrides at high pressure
- Modeling the Unconventional Superconducting Properties of Expanded AC Fullerides
- First-principles study of the pressure and crystal-structure dependences of the superconducting transition temperature in compressed sulfur hydrides
- Effect of van Hove singularities on high-Tc superconductivity in H3S
- Unified understanding of superconductivity and Mott transition in alkali-doped fullerides from first principles
- Non magnetic molecular Jahn-Teller Mott insulators
- Electron-phonon coupling in the C60 fullerene within the many-body GW approach
- Strongly Correlated Superconductivity and Pseudogap Phase near a multi-band Mott Insulator
- Electronic orders in multi-orbital Hubbard models with lifted orbital degeneracy
- Ab initio downfolding for electron-phonon coupled systems: constrained density-functional perturbation theory (cDFPT)
- Metal-insulator transitions: Influence of lattice structure, Jahn-Teller effect, and Hund's rule coupling
- Exotic s-wave superconductivity in alkali-doped fullerides
- Spontaneous orbital-selective Mott transitions and the Jahn-Teller metal of AC
- Coexistence of full-gap superconductivity and pseudogap in two-dimensional fullerides
- Efficient ab initio Migdal-Eliashberg calculation considering the retardation effect in phonon-mediated superconductors
- Long-range orders, spin- and orbital-freezing in the two-band Hubbard model
- Ultrafast switching of composite order in AC
- Double-expansion impurity solver for multiorbital models with dynamically screened U and J
- Unconventional Pairing from Local Orbital Fluctuations in Strongly Correlated AC
- Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model
- Staggered ordered phases in the three-orbital Hubbard model
- Odd-frequency pairing inherent in Bogoliubov Fermi liquid
- Entropy and electronic orders of the three-orbital Hubbard model with antiferromagnetic Hund coupling
- Unconventional orbital ordering and emergent dimensional reduction in fulleride superconductors
- Multipole representation for anisotropic Coulomb interactions
- Spin-orbital model for fullerides
- Repulsive interaction helps superconductivity in fullerides