Enhanced superconducting correlations in the Emery model and its connections to strange metallic transport and normal state coherence

Abstract

Numerical evidence for superconductivity in the single-band Hubbard model is elusive or ambiguous despite extensive study, raising the question of whether the single-band Hubbard model is a faithful low energy effective model for cuprates, and whether explicitly including the oxygen ions will recover the properties necessary for a superconducting transition. Here we show, by using numerically exact determinant quantum Monte Carlo (DQMC) simulations of the doped Emery model, that while the single-band model exhibits strikingly T-linear resistivity, the three-band model crosses the resistivity of the single-band model from above, indicating a crossover to a more metallic transport regime. The enhanced conductivity is mainly contributed by a steep increase in the diffusivity of the three-band model at the crossover, suggesting that three-band transport is more coherent than single-band transport at lower temperatures. Below the same crossover temperature in the three-band model, the pair-field susceptibility increases more steeply than at higher temperatures or when compared to the single-band model. This suggests a possible connection between superconductivity and coherent transport, and further implies that coherent transport might be necessary for a model to capture the high-temperature superconductivity observed in hole-doped cuprates.

arXiv comment7 pages, 3 figures (main text)

References in corpus (20)

• Stripe order in the underdoped region of the two-dimensional Hubbard model
• The Hubbard Model
• Fractionalized Fermi liquids
• Absence of superconductivity in the pure two-dimensional Hubbard model
• Universal scaling relation in high-temperature superconductors
• Bad metallic transport in a cold atom Fermi-Hubbard system
• Superconductivity in the Hubbard model and its interplay with charge stripes and next-nearest hopping t'
• Planckian Dissipation in Metals
• Coexistence of superconductivity with partially filled stripes in the Hubbard model
• Strange metallicity in the doped Hubbard model
• Ground state phase diagram of the doped Hubbard model on the 4-leg cylinder
• Hybrid-space density matrix renormalization group study of the doped two-dimensional Hubbard model
• Plaquette versus ordinary $d$-wave pairing in the $t^{\prime }$-Hubbard model on a width 4 cylinder
• Characterizing the three-orbital Hubbard model with determinant quantum Monte Carlo
• Analytical continuation of imaginary axis data for optical conductivity
• Stripe order enhanced superconductivity in the Hubbard model
• Enhanced superconductivity by near-neighbor attraction in the doped Hubbard model
• Density-matrix-renormalization-group-based downfolding of the three-band Hubbard model: the importance of density-assisted hopping
• Universal relationship between the penetration depth and the normal-state conductivity in YBaCuO
• The significance of "stripes" in the physics of the cuprates, the Hubbard model, and other highly correlated electronic systems