Superconductivity in ionic-Hubbard model on honeycomb lattice

T. Watanabe; S. Ishihara

doi:10.1016/j.physc.2012.02.021

Superconductivity in ionic-Hubbard model on honeycomb lattice

T. Watanabe, S. Ishihara

SCI - Physics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

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 language	English
Pages (from-to)	56-58
Number of pages	3
Journal	Physica C: Superconductivity and its applications
Volume	484
DOIs	https://doi.org/10.1016/j.physc.2012.02.021
Publication status	Published - 2013 Jan 15

Keywords

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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10.1016/j.physc.2012.02.021

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title = "Superconductivity in ionic-Hubbard model on honeycomb lattice",

abstract = "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.",

keywords = "Honeycomb lattice, Ionic-Hubbard model, Layered nitride superconductor, Variational Monte Carlo method",

author = "T. Watanabe and S. Ishihara",

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doi = "10.1016/j.physc.2012.02.021",

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T1 - Superconductivity in ionic-Hubbard model on honeycomb lattice

AU - Watanabe, T.

AU - Ishihara, S.

PY - 2013/1/15

Y1 - 2013/1/15

N2 - 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.

AB - 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.

KW - Honeycomb lattice

KW - Ionic-Hubbard model

KW - Layered nitride superconductor

KW - Variational Monte Carlo method

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DO - 10.1016/j.physc.2012.02.021

M3 - Article

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SN - 0921-4534

VL - 484

SP - 56

EP - 58

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

ER -

Superconductivity in ionic-Hubbard model on honeycomb lattice

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Keywords

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