Dimensional reduction and odd-frequency pairing of the checkerboard-lattice hubbard model at 1/4-filling

Yuki Yanagi, Yasufumi Yamashita, Kazuo Ueda

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The ferromagnetism of the checkerboard-lattice Hubbard model at quarter filling is one of the few exact ferromagnetic ground states known in the family of Hubbard models. When the nearest neighbor hopping, t1, is negligible compared with the second neighbor one, t2, the system reduces to a collection of Hubbard chains. We find that the 1D character is surprisingly robust as long as t1 < t2. This phenomenon of dimensional reduction due to the geometrical frustration leads to peculiar magnetic orders with 1D character for intermediate U and is responsible for odd-frequency superconducting states close to the magnetic boundary.

Original languageEnglish
Article number123701
Journaljournal of the physical society of japan
Volume81
Issue number12
DOIs
Publication statusPublished - 2012 Dec
Externally publishedYes

Keywords

  • Checkerboard-lattice Hubbard model
  • Dimensional reduction
  • Ferromagnetism
  • Flat-band
  • Odd-frequency superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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