Relationship between superconductivity and anisotropy in two-dimensional Hubbard model

Kenji Kobayashi, Hisatoshi Yokoyama

Research output: Contribution to journalConference articlepeer-review


In connection with the symmetry-breaking phenomena found in cuprate superconductors, we check whether an anisotropy spontaneously appears or not in strongly correlated electrons that exhibit superconductivity and/or antiferromagnetism. A variational Monte Carlo method is applied to the square-lattice Hubbard model (U/t = 12) with diagonal transfer t′. In the trial wave function used, we introduce band renormalization factors including adjustable parameters for the anisotropy corresponding to the fourfold rotational symmetry breaking. It is confirmed that the anisotropy appears in the overdoped regime, where the Fermi-liquid features are predominant. In the underdoped area, the anisotropy does not appear for t′/t = 0 and +0.3, whereas it possibly appears in the underdoped regime for t′/t = -0.3.

Original languageEnglish
Article number012025
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2019 Oct 15
Event31st International Symposium on Superconductivity, ISS 2018 - Tsukuba, Ibaraki, Japan
Duration: 2018 Dec 122018 Dec 14


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