Effect of inter-band nesting on superconductivity in stacked honeycomb lattices

Seiichiro Onari; Kazuhiko Kuroki; Ryotaro Arita; Hideo Aoki

doi:10.1016/S0921-4526(02)02365-7

Effect of inter-band nesting on superconductivity in stacked honeycomb lattices

Seiichiro Onari, Kazuhiko Kuroki, Ryotaro Arita, Hideo Aoki

Graduate School of Natural Science and Technology

Research output: Contribution to journal › Article

Abstract

In order to exemplify our idea that inter-band nesting can favor superconductivity arising electron repulsion in layered, non-Bravais lattices, we have looked into the two-band Hubbard model on a stack of honeycomb lattices with the fluctuation exchange approximation. By systematically varying the band filling and transfers, the inter-band nesting is indeed found to give rise to gap functions that change sign across the bands, with a time-reversal-broken di + id₂ intra-band pairing symmetry.

Original language	English
Pages (from-to)	1437-1439
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	329-333
Issue number	II
DOIs	https://doi.org/10.1016/S0921-4526(02)02365-7
Publication status	Published - May 2003

Keywords

Electron correlation
Hubbard model
Superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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AU - Kuroki, Kazuhiko

AU - Arita, Ryotaro

AU - Aoki, Hideo

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N2 - In order to exemplify our idea that inter-band nesting can favor superconductivity arising electron repulsion in layered, non-Bravais lattices, we have looked into the two-band Hubbard model on a stack of honeycomb lattices with the fluctuation exchange approximation. By systematically varying the band filling and transfers, the inter-band nesting is indeed found to give rise to gap functions that change sign across the bands, with a time-reversal-broken di + id2 intra-band pairing symmetry.

AB - In order to exemplify our idea that inter-band nesting can favor superconductivity arising electron repulsion in layered, non-Bravais lattices, we have looked into the two-band Hubbard model on a stack of honeycomb lattices with the fluctuation exchange approximation. By systematically varying the band filling and transfers, the inter-band nesting is indeed found to give rise to gap functions that change sign across the bands, with a time-reversal-broken di + id2 intra-band pairing symmetry.

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KW - Superconductivity

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