A 3D Tight-Binding Model for La-Based Cuprate Superconductors

Abstract

Motivated by the recent experimental determination of the three-dimensional Fermi surface of overdoped La-based cuprate superconductors [Horio et al., Phys. Rev. Lett. 2018, 121, 077004], we revisit the tight-binding parameterization of their conduction band. We construct a minimal tight-binding model entailing eight orbitals, two of them involving apical oxygen ions. Parameter optimization allows to almost perfectly reproduce the three-dimensional conduction band as obtained from density functional theory (DFT). We discuss how each parameter entering this multiband model influences it, and show that the peculiar form of its dispersion severely constraints the parameter values. We then evidence that standard perturbative derivation of an effective one-band model is poorly converging because of the comparatively small value of the charge transfer gap. Yet, this allows us to unravel the microscopical origin of the in-plane and out-of-plane hopping amplitudes. An alternative approach to the computation of the tight-binding parameters of the effective model is presented and worked out. It results that the agreement with DFT is preserved provided longer-ranged hopping amplitudes are retained. A comparison with existing models is also performed. Finally, the Fermi surface, showing staggered pieces alternating in size and shape, is compared to experiment, with the density of states also being calculated.

25 pages, 16 figures

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• Dark states of electrons in a quantum system with two pairs of sublattices
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• Coulomb electron pairing in a tight-binding model of La-based cuprate superconductors
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• Many-body perturbation theory for strongly correlated effective Hamiltonians using effective field theory methods
• Enhanced pairing mechanism in Cuprate-type crystals