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ワタナベ ツトム
Tsutomu Watanabe
渡邉 努 所属 千葉工業大学 先進工学部 教育センター（先進工学部） 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2013/01 |
| 形態種別 | 学術雑誌 |
| 査読 | 査読あり |
| 標題 | Superconductivity in ionic-Hubbard model on honeycomb lattice |
| 執筆形態 | 共著 |
| 掲載誌名 | Physica C Superconductivity and its Application |
| 掲載区分 | 国外 |
| 出版社・発行元 | Elsevier |
| 巻・号・頁 | 484,pp.56-58 |
| 著者・共著者 | Tsutomu Watanabe, Sumio Ishihara |
| 概要 | To consider the origin of superconductivity (SC) in layered nitride superconductors, we study an ionic-Hubbard model on a honeycomb lattice, using an optimization variational Monte Carlo method. In carrier-doped band insulating systems, a spin singlet d-wave SC state is stabilized. Then, the spin fluctuation remains relatively strong even for large ionic potential. We find that a renormalization effect of the energy band primarily contributes to the spin fluctuation, which favors the SC. |