Competition among various charge-inhomogeneous states and d -wave superconducting state in Hubbard models on square lattices

Kota Ido, Takahiro Ohgoe, Masatoshi Imada

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Abstract

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 δ, which agrees with the experiments for La-based cuprates at δ=1/8. For lower δ, we find a phase separation. Implications of the emergent attraction for cuprates are discussed.

Original languageEnglish
Article number045138
JournalPhysical Review B
Volume97
Issue number4
DOIs
Publication statusPublished - 2018 Jan 22
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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