Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physica C Superconductivity

Band-renormalization effect in coexistent state of d-wave superconducting and antiferromagnetic orders for Hubbard model

R. Sato, H. Yokoyama

Published Apr 29, 2016• 0 citations
Publisher
DOI
10.1016/j.physc.2016.03.019

Related papers

Antiferromagnetism and d-wave superconductivity in the one-band Hubbard model using V-CPT

A.–M. S. Tremblay, David Sénéchal, Pierre-Luc Lavertu +1 more

Bulletin of the American Physical Society•Mar 24, 2005•0 citations

Band Renormalization Effect on Interplay between Antiferromagnetism and Superconductivity in Hubbard Model

Kenji Kobayashi, Hisatoshi Yokoyama

To study the relationship between antiferromagnetism (AF) and superconductivity (SC) in cuprate superconductors, we have performed a variational Monte Carlo calculation on the two-dimensional Hubbard model with a diagonal transfer t' [1,2]. The following improvements are introduced into the variational function: (1) Coexistence of AF and d-wave singlet gaps that allows a continuous description of their interplay, (2) band renormalization effect owing to the electron correlation up to the fourth-neighbor hoppings, and (3) refined doublon-holon correlation factors. It is found that the AF and SC orders become coexistent or competitive according to the values of model parameters, U/t, t'/t, and δ (doping rate), and the effective band is strongly renormalized for large U/t and low doping rates, so as to recover the nesting condition favorable to AF.

Asia Pacific Physics Conference (APPC)•Mar 19, 2014•2 citations

Evidence for d-wave superconductivity in the repulsive Hubbard model

Werner Fettes, I. Morgenstern

arXiv:cond-mat/9801227•The European Physical Journal B•Jul 1, 1999•2 citations

Band-Renormalization Effect on Superconductivity and Antiferromagnetism in Two-Dimensional t–J Model

Ryo Sato, Hisatoshi Yokoyama

The coexistence or exclusivity of \(d_{x^{2} - y^{2}}\)-wave superconducting (d-SC) and antiferromagnetic (AF) orders and instability toward phase separation (PS) are reconsidered for the square-lattice t–J model with the diagonal transfer (t′) term near half filling. To reliably treat the strong correlation including the local constraint of no double occupancy, we use a variational Monte Carlo method, in which the band-renormalization effect (BRE) is also incorporated. The results are compared with those recently obtained for the corresponding Hubbard model [J. Phys. Soc. Jpn. 85, 074701 (2016)]. It is found that BRE has a very strong effect on the AF order and greatly modifies the ground-state phase diagram in the t′–δ space (δ: doping rate) proposed in previous studies, especially for large |t′/t|. In a wide range of t′/t (|t′/t| ≤ 0.5) and for any underdoped δ (\( \lesssim \) 0.15), the AF order arises for J/t = 0.3, similarly to in the Hubbard model. In contrast with the Hubbard model, however, the d-SC order also arises down to small δ in a wide range of t′/t (\( \gtrsim \) −0.2) and coexists with the AF order even for t′/t < 0 (type-II AF regime). Furthermore, there is no instability toward PS for any t′/t and δ for J/t = 0.3.

Journal of the Physical Society of Japan•Oct 3, 2018•4 citations

Inhomogeneity and d-wave superconductivity in the Hubbard model

Shiladitya Chakraborty, David Sénéchal, A.–M. S. Tremblay

Bulletin of the American Physical Society•Mar 24, 2011•0 citations

Functional renormalization group for d-wave superconductivity

H. C. Krahl, CHRISTOF WETTERICH

arXiv:cond-mat/0608667•Physics Letters A•Mar 24, 2007•24 citations
To study the relationship between antiferromagnetism (AF) and superconductivity (SC) in cuprate superconductors, we have performed a variational Monte Carlo calculation on the two-dimensional Hubbard model with a diagonal transfer t' [1,2]. The following improvements are introduced into the variational function: (1) Coexistence of AF and d-wave singlet gaps that allows a continuous description of their interplay, (2) band renormalization effect owing to the electron correlation up to the fourth-neighbor hoppings, and (3) refined doublon-holon correlation factors. It is found that the AF and SC orders become coexistent or competitive according to the values of model parameters, U/t, t'/t, and δ (doping rate), and the effective band is strongly renormalized for large U/t and low doping rates, so as to recover the nesting condition favorable to AF.
The coexistence or exclusivity of dx2−y2d_{x^{2} - y^{2}}dx2−y2​-wave superconducting (d-SC) and antiferromagnetic (AF) orders and instability toward phase separation (PS) are reconsidered for the square-lattice t–J model with the diagonal transfer (t′) term near half filling. To reliably treat the strong correlation including the local constraint of no double occupancy, we use a variational Monte Carlo method, in which the band-renormalization effect (BRE) is also incorporated. The results are compared with those recently obtained for the corresponding Hubbard model [J. Phys. Soc. Jpn. 85, 074701 (2016)]. It is found that BRE has a very strong effect on the AF order and greatly modifies the ground-state phase diagram in the t′–δ space (δ: doping rate) proposed in previous studies, especially for large |t′/t|. In a wide range of t′/t (|t′/t| ≤ 0.5) and for any underdoped δ (≲ \lesssim ≲ 0.15), the AF order arises for J/t = 0.3, similarly to in the Hubbard model. In contrast with the Hubbard model, however, the d-SC order also arises down to small δ in a wide range of t′/t (≳ \gtrsim ≳ −0.2) and coexists with the AF order even for t′/t < 0 (type-II AF regime). Furthermore, there is no instability toward PS for any t′/t and δ for J/t = 0.3.