4 papers
Cuprate d-wave superconductivity based on Non perturbative many body theory for spin fluctuation
Jianwei Gong, Junnian Xiong, Ruitao Xiao +4
We employ the nonperturbative many-body spin GW method to compute the single-particle Green's function, and the covariance method to evaluate the two-body correlation functions, fo…
Nonpertubative Many-Body Theory for the Two-Dimensional Hubbard Model at Low Temperature: From Weak to Strong Coupling Regimes
Ruitao Xiao, Yingze Su, Junnian Xiong +3
In theoretical studies of two-dimensional (2D) systems, the Mermin-Wagner theorem prevents continuous symmetry breaking at any finite temperature, thus forbidding a Landau phase tr…
Application of Many-body Non-perturbative Theories to the Three-Dimensional Attractive Hubbard Model
Junnian Xiong, Hui Li, Yingze Su +1
The attractive Fermi-Hubbard model stands out as a simple model for studying the pairing and superconductivity of fermions on a lattice. In this article, we apply several many-body…
Post- theory and its application to pseudogap in strongly correlated system
Hui Li, Yingze Su, Junnian Xiong +3
The approximation is a widely used framework for studying correlated materials, but it struggles with certain limitations, such as its inability to explain pseudogap phenomena…