Interplay between staggered flux and d-wave superconducting states in Hubbard model

29th International Symposium on Superconductivity

Kobayashi, Kenji^1 ; Yokoyama, Hisatoshi^2

Department of Natural Science, Chiba Institute of Technology, Shibazono, Narashino

275-0023, Japan^1

Department of Physics, Tohoku University, Aoba-ku, Sendai

980-8578, Japan^2

关键词: Pseudogap state;    Renormalization;    Staggered flux state;    Superconducting state;    Variational Monte Carlo method;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012031/pdf
DOI  :  10.1088/1742-6596/871/1/012031

来源: IOP

【 摘 要 】

With cuprate superconductors in mind, we check whether the d-wave superconducting (dSC) state coexists with or excludes the staggered flux (SF) state, which was revealed to be the strong candidate for the pseudogap state. To this end, we use a variational Monte Carlo method for the square Hubbard model with diagonal transfer t′. In the trial wave function, dSC and SF orders coexist, which allows a continuous description of their interplay; essential factors for Mott physics and band renormalization are also included. It is found that the SF state does not coexist with dSC and is unstable for U/t = 12 regardless of the value of t′/t within the present work.