2017/12/19 by Kota Ido, Takahiro Ohgoe, Masatoshi Imada · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Condensed matter physics #Coulomb #Cuprate #Excited state #Ground state #Hubbard model #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Superconductivity #Variational Monte Carlo #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.97.045138
published as Phys. Rev. B 97, 045138 (2018) · 11 pages, 13 figures
arxiv created 2017/12/19 · openalex created_date 2017/12/22 · openalex publication_date 2018/01/22 · arxiv updated 2018/01/24 · openalex updated_date 2026/08/05
We study competitions among charge-uniform and -inhomogeneous states in two-dimensional Hubbard models by using a variational Monte Carlo method. At realistic parameters for cuprate superconductors, emergent effective attraction of carriers generated from repulsive Coulomb interaction leads to charge/spin stripe ground states, which severely compete with uniform superconducting excited states in the energy scale of 10 K for cuprates. Stripe period increases with decreasing hole doping \ensuremathδ, which agrees with the experiments for La-based cuprates at \ensuremathδ=1/8. For lower \ensuremathδ, we find a phase separation. Implications of the emergent attraction for cuprates are discussed.