Superconductivity in ionic-Hubbard model on honeycomb lattice

T. Watanabe, S. Ishihara

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


To consider the origin of superconductivity (SC) in layered nitride superconductors, we study an ionic-Hubbard model on a honeycomb lattice, which consists of two sublattices with a level offset, using an optimization variational Monte Carlo method. The parameter values for the Coulomb interaction and the level offset, to realize a band insulator, is evaluated in the non-doped system. In carrier-doped band insulating systems, a spin singlet d-wave SC state is stabilized. The spin fluctuation remains relatively strong even for large level offsets. We find that a renormalization effect of the energy band primarily contributes to the spin fluctuation.

Original languageEnglish
Pages (from-to)56-58
Number of pages3
JournalPhysica C: Superconductivity and its applications
Publication statusPublished - 2013 Jan 15


  • Honeycomb lattice
  • Ionic-Hubbard model
  • Layered nitride superconductor
  • Variational Monte Carlo method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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