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

Broken symmetry instabilities and solutions of the extended Hubbard model

Masa-aki Ozaki, Shoji Yamamoto

Published Dec 1, 1991• 0 citations
Publisher
DOI
10.1016/0921-4534(91)90990-g

Related papers

Broken symmetry solutions of the two dimensional extended Hubbard model and their instability conditions

昌司 山本

•Jan 1, 1993•0 citations

Ground State Instability and Attractive Interactions in the Extended Hubbard Model

S. A. Trugman

Physics of Low-Dimensional Systems•Jul 1, 1989•0 citations

Electronic instabilities of extended Hubbard models on the honeycomb lattice

David S 'anchez de la Pe na, Julian Lichtenstein, Carsten Honerkamp A

Bulletin of the American Physical Society•Mar 16, 2017•0 citations

Broken symmetry solutions of the two‐dimensional extended hubbard model and their instability conditions

Shoji Yamamoto, Masa-aki Ozaki

Abstract Instabilities of the restricted Hartree–Fock (HF) state of the two‐dimensional extended Hubbard model under doping are studied with the linear response theory employing the linearized Bethe–Salpeter equation. Boundaries of the instabilities for the ordering vectors q = Q ≡ (π, π) and q = Q0 ≡ (0, 0) are given in terms of the interaction strength parameters at various doping levels. With doping, dominant instabilities generally change from ones for q = Q to ones for q = Q0. Broken symmetry phases obtained from the instabilities are also studied and classified using the group‐theoretical technique. For q = Q, two more new phases are obtained in addition to the four nonmagnetic and five magnetic phases that have been already derived by one of the authors. For q = Q0, three nonmagnetic and five magnetic phases are obtained. Deriving the explicit forms of the charge current and spin current operators in the HF approximation, charge current and spin current densities in the broken symmetry states are discussed in detail. © 1992 John Wiley & Sons, Inc.

International Journal of Quantum Chemistry•Dec 5, 1992•12 citations

d -Wave Superconductivity in the Hubbard Model

Thomas Maier, Mark Jarrell, Thomas Pruschke +1 more

The superconducting instabilities of the doped repulsive 2D Hubbard model are studied in the intermediate to strong coupling regime with the help of the dynamical cluster approximation. To solve the effective cluster problem we employ an extended noncrossing approximation, which allows for a transition to the broken symmetry state. At sufficiently low temperatures we find stable d-wave solutions with off-diagonal long-range order. The maximal T(c) approximately 150 K occurs for a doping delta approximately 20% and the doping dependence of the transition temperatures agrees well with the generic high- T(c) phase diagram.

arXiv:cond-mat/0002352•Physical Review Letters•Aug 14, 2000•156 citations

Symmetry breaking and the order parameters of the Hubbard model

LIVI R, Arianna Montorsi, Mario Rasetti

•Jan 1, 1992•0 citations
Abstract Instabilities of the restricted Hartree–Fock (HF) state of the two‐dimensional extended Hubbard model under doping are studied with the linear response theory employing the linearized Bethe–Salpeter equation. Boundaries of the instabilities for the ordering vectors q = Q ≡ (π, π) and q = Q0 ≡ (0, 0) are given in terms of the interaction strength parameters at various doping levels. With doping, dominant instabilities generally change from ones for q = Q to ones for q = Q0. Broken symmetry phases obtained from the instabilities are also studied and classified using the group‐theoretical technique. For q = Q, two more new phases are obtained in addition to the four nonmagnetic and five magnetic phases that have been already derived by one of the authors. For q = Q0, three nonmagnetic and five magnetic phases are obtained. Deriving the explicit forms of the charge current and spin current operators in the HF approximation, charge current and spin current densities in the broken symmetry states are discussed in detail. © 1992 John Wiley & Sons, Inc.
The superconducting instabilities of the doped repulsive 2D Hubbard model are studied in the intermediate to strong coupling regime with the help of the dynamical cluster approximation. To solve the effective cluster problem we employ an extended noncrossing approximation, which allows for a transition to the broken symmetry state. At sufficiently low temperatures we find stable d-wave solutions with off-diagonal long-range order. The maximal T(c) approximately 150 K occurs for a doping delta approximately 20% and the doping dependence of the transition temperatures agrees well with the generic high- T(c) phase diagram.