Excitonic order and superconductivity in the two-orbital hubbard model: Variational cluster approach

Ryo Fujiuchi, Koudai Sugimoto, Yukinori Ohta

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Using the variational cluster approach based on the self-energy functional theory, we study the possible occurrence of excitonic order and superconductivity in the two-orbital Hubbard model with intra- and inter-orbital Coulomb interactions. It is known that an antiferromagnetic Mott insulator state appears in the regime of strong intra-orbital interaction, a band insulator state appears in the regime of strong inter-orbital interaction, and an excitonic insulator state appears between them. In addition to these states, we find that the s±-wave superconducting state appears in the small-correlation regime, and the dx2y2-wave superconducting state appears on the boundary of the antiferromagnetic Mott insulator state. We calculate the single-particle spectral function of the model and compare the band gap formation due to the superconducting and excitonic orders.

本文言語English
論文番号063705-1
ジャーナルJournal of the Physical Society of Japan
87
6
DOI
出版ステータスPublished - 2018
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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