Predominance of Antiferromagnetism in Two-dimensional Underdoped Hubbard Model

H. Yokoyama, R. Sato, K. Kobayashi

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1 Citation (Scopus)


Most studies of square-lattice Hubbard models in view of cuprate superconductors hitherto have neglected a band-renormalization effect (BRE) owing to strong electron correlation, especially, for an antiferromagnetic (AF) order. In this study, we introduce BRE into a d-wave superconducting and an AF states independently in the framework of many-body variation theory. It is found that, in sharp contrast to usual understandings, energy of an AF state is sizably reduced by BRE, and the AF area in the ground-state phase diagram is greatly expanded to cover the whole underdoped regime. The AF state with BRE exhibits distinct features according as the value of diagonal hopping ratio t′/t is greater or less than t′/t ∼ - 0.05.

Original languageEnglish
Pages (from-to)9-12
Number of pages4
JournalPhysics Procedia
Publication statusPublished - 2016
Event28th International Symposium on Superconductivity, ISS 2015 - Tokyo, Japan
Duration: 2015 Nov 162015 Nov 18


  • Hubbard model
  • Superconductivity
  • antiferromagnetism
  • band renormalization effect
  • cuprate
  • phase separation
  • variation theory


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