Enhanced superconductivity by near-neighbor attraction in the doped extended Hubbard model

Peng, Cheng; Wang, Yao; Wen, Jiajia; Lee, Young S.; Devereaux, T. P.; Jiang, Hong-Chen

doi:10.1103/physrevb.107.l201102

Cited by 19 publications

(2 citation statements)

References 49 publications

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“…However, these superconducting correlations are subdominant to charge density wave (CDW) correlations and become weaker on wider cylinders. A recent DMRG study on 4-leg ladders has shown that an effective nearest-neighbor electron–electron attraction can result in dominant quasi-long-range d -wave superconducting correlations on the hole-doped side with negative , where the crossover between dominant superconducting and CDW correlations occurs near V ~ − t h 36 . Yet that ground state remains qualitatively consistent with a Luther-Emery liquid, as found in the simple Hubbard model with on the same ladder.…”

Section: Discussionmentioning

confidence: 99%

Traces of electron-phonon coupling in one-dimensional cuprates

et al. 2023

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The appearance of certain spectral features in one-dimensional (1D) cuprate materials has been attributed to a strong, extended attractive coupling between electrons. Here, using time-dependent density matrix renormalization group methods on a Hubbard-extended Holstein model, we show that extended electron-phonon (e–ph) coupling presents an obvious choice to produce such an attractive interaction that reproduces the observed spectral features and doping dependence seen in angle-resolved photoemission experiments: diminished 3kF spectral weight, prominent spectral intensity of a holon-folding branch, and the correct holon band width. While extended e–ph coupling does not qualitatively alter the ground state of the 1D system compared to the Hubbard model, it quantitatively enhances the long-range superconducting correlations and suppresses spin correlations. Such an extended e–ph interaction may be an important missing ingredient in describing the physics of the structurally similar two-dimensional high-temperature superconducting layered cuprates, which may tip the balance between intertwined orders in favor of uniform d-wave superconductivity.

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Section: Discussionmentioning

confidence: 99%

Traces of electron-phonon coupling in one-dimensional cuprates

et al. 2023

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“…In recent years, the properties of the EHM have been analyzed using a variety of approaches, including, among others, mean-field theory [50][51][52]72], functional renormalization group (fRG) [39], exact diagonalization (ED) [29,32,55,61], density-matrix renormalization group (DMRG) [57,63], Quantum Monte Carlo (QMC) [70,87,89,92] and the fluctuationexchange approximation (FLEX) [56]. However, many of the approaches used are best suited for studying the weak-coupling or the strong-coupling limit, and there are few that can describe the intermediate-coupling regime equally well.…”

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CDMFT+HFD: An extension of dynamical mean field theory for nonlocal interactions applied to the single band extended Hubbard model

Kundu,

Sénéchal

2024

SciPost Phys. Core

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We examine the phase diagram of the extended Hubbard model on a square lattice, for both attractive and repulsive nearest-neighbor interactions, using CDMFT+HFD, a combination of Cluster Dynamical Mean Field theory (CDMFT) and a Hartree-Fock mean-field decoupling of the inter-cluster extended interaction. For attractive non-local interactions, this model exhibits a region of phase separation near half-filling, in the vicinity of which we find islands of d-wave superconductivity, decaying rapidly as a function of doping, with disconnected regions of extended s-wave order at smaller (higher) electron densities. On the other hand, when the extended interaction is repulsive, a Mott insulating state at half-filling is destabilized by hole doping, in the strong-coupling limit, in favor of d-wave superconductivity. At the particle-hole invariant chemical potential, we find a first-order phase transition from antiferromagnetism (AF) to d-wave superconductivity as a function of the attractive nearest-neighbor interaction, along with a deviation of the density from the half-filled limit. A repulsive extended interaction instead favors charge-density wave (CDW) order at half-filling.

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Pair density wave in the doped three-band Hubbard model on two-leg square cylinders

Jiang

2023

Phys. Rev. B

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Enhanced superconductivity by near-neighbor attraction in the doped extended Hubbard model

Cited by 19 publications

References 49 publications

Traces of electron-phonon coupling in one-dimensional cuprates

Traces of electron-phonon coupling in one-dimensional cuprates

CDMFT+HFD: An extension of dynamical mean field theory for nonlocal interactions applied to the single band extended Hubbard model

Pair density wave in the doped three-band Hubbard model on two-leg square cylinders

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