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

Kota Ido, Takahiro Ohgoe, Masatoshi Imada

Research output: Contribution to journalArticle

10 Citations (Scopus)

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

Fingerprint

Hubbard model
Coulomb interactions
Excited states
Phase separation
Ground state
cuprates
Monte Carlo methods
Doping (additives)
attraction
Experiments
two dimensional models
Monte Carlo method
ground state
Cuprate superconductors
excitation
interactions
energy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Competition among various charge-inhomogeneous states and d -wave superconducting state in Hubbard models on square lattices. / Ido, Kota; Ohgoe, Takahiro; Imada, Masatoshi.

In: Physical Review B, Vol. 97, No. 4, 045138, 22.01.2018.

Research output: Contribution to journalArticle

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