Title
Effect of long-range hopping on Tc in a two-dimensional Hubbard-Holstein model of the cuprates
Document Type
Article
Publication Date
August 2008
Publication Title
Physical Review B
Volume
78
Issue Number
6
DOI
10.1103/PhysRevB.78.060502
Keywords
Hopping, Hubbard, Holstein, Parameters, Antiferromagnetic, Polaronic, Enhances
Disciplines
Astrophysics and Astronomy | Physical Sciences and Mathematics | Physics
Abstract
We study the effect of long-range hoppings on Tc for the two-dimensional (2D) Hubbard model with and without Holstein phonons using parameters evaluated from band-structure calculations for cuprates. Employing the dynamical cluster approximation (DCA) with a quantum Monte Carlo (QMC) cluster solver for a 4-site cluster, we observe that without phonons, the long-range hoppings, t′ and t′′, generally suppress Tc. We argue that this trend remains valid for larger clusters. In the presence of the Holstein phonons, a finite t′ enhances Tc in the under-doped region for the hole-doped system, consistent with local-density approximation (LDA) calculations and experiment. This is interpreted through the suppression of antiferromagnetic (AF) correlations and the interplay between polaronic effects and the antiferromagnetism.
Recommended Citation
Ehsan Khatami, A. Macridin, and M. Jarrell. "Effect of long-range hopping on Tc in a two-dimensional Hubbard-Holstein model of the cuprates" Physical Review B (2008). https://doi.org/10.1103/PhysRevB.78.060502
Comments
This article originally appeared in Physical Review B, volume 78, issue 6, 2008, published by the American Physical Society. ©2008 American Physical Society. The article can also be found online at this link.
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