Theory of the electronic properties in three-dimensional surface network materials
| Project/Area Number |
17K05496
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | グラフェン / ２次元物質 / 量子ホール効果 / 2次元物質 / 多孔質グラフェン / 物性理論 / ナノ材料 / 半導体物性 |
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| Outline of Final Research Achievements |
We theoretically studied the physical properties of a wide variety of geometric structures of graphenes, including the electronic band structures, the magnetic field effects and the phonon properties. In three-dimensional graphene, i.e., the negatively-curved three- dimensional (3D) graphene network, we found that the 3D quantum Hall effect is caused by emergent one-dimensional channels in the magnetic field. We also investigated the moire effects on the electron and phonon properties in the twisted bilayer graphenes, and also studied the quasi-crystalline effect in 30-degree twisted bilayer graphene theoretically and experimentally.
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| Academic Significance and Societal Importance of the Research Achievements |
究極に薄い２次元物質であるグラフェンは、面と面をつなぎ合わせることで様々な幾何学構造を実現でき、その構造に依存して全く異なる性質を呈する。この研究ではグラフェンが作る様々な形の物質に着目し、その物理的性質を理論的に調べた。グラフェンが曲面となって空間を埋め尽くす３次元グラフェンでは、曲面のトポロジーによって全く異なる電気伝導特性を示すことを見出した。またグラフェン同士を回転させて重ねたねじれ積層グラフェンでは、モアレ干渉効果によって、もとのグラフェンとは全く異なる電子状態や格子振動が生じることを明らかにした。これらの研究は未来の物質科学とナノテクノロジーの基礎になることが期待される。
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Report
(4 results)
Research Products
(48 results)
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[Journal Article] Dirac Electrons in a Dodecagonal Graphene Quasicrystal2018
Author(s)
Sung Joon Ahn, Pilkyung Moon, Tae-Hoon Kim, Hyun-Woo Kim, Ha-Chul Shin, Eun Hye Kim, Hyun Woo Cha, Se-Jong Kahng, Philip Kim, Mikito Koshino, Young-Woo Son, Cheol-Woong Yang, Joung Real Ahn
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Journal Title
Science
Volume: 361
Issue: 6404
Pages: 782-786
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Emergence of Tertiary Dirac Points in Graphene Moire Superlattices2017
Author(s)
G. Chen, M. Sui, D. Wang, S. Wang, J. Jung, P. Moon, S. Adam, K. Watanabe, T. Taniguchi, S. Zhou, M. Koshino, G. Zhang, Y. Zhang
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Journal Title
Nano Lett.
Volume: 17
Issue: 6
Pages: 3576-3581
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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