Superconductivity induced by interband nesting in the three-dimensional honeycomb lattice

Seiichiro Onari, Kazuhiko Kuroki, Ryotaro Arita, Hideo Aoki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In order to study whether the interband nesting can favor superconductivity arising from electron-electron repulsion in a three-dimensional system, we have looked at the repulsive Hubbard model on a stack of honeycomb (i.e., non-Bravais) lattices with the fluctuation exchange approximation, partly motivated by the superconductivity observed in (formula presented) By systematically changing the shape of Fermi surface with varied band filling n and the third-direction hopping, we have found that the pair scattering across the two bands is indeed found to give rise to gap functions that change sign across the bands and behave as an s or d wave within each band. This implies (a) the electron repulsion can assist gapful pairing when a phonon-mechanism pairing exists and (b) the electron repulsion alone, when strong enough, can give rise to a d-wave-like pairing, which should be, for a group-theoretic reason, a time-reversal broken (formula presented) with point nodes in the gap.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number18
DOIs
Publication statusPublished - Jan 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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