Study of the electronic properties of zigzag hexagonal nanopits and point defects on graphene on an atomic scale, and control of the electonic properties of graphene
| Project/Area Number |
15K05159
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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 II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MATSUI TOMOHIRO 東京大学, 大学院理学系研究科(理学部), 助教 (40466793)
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| Co-Investigator(Kenkyū-buntansha) |
福山 寛 東京大学, 大学院理学系研究科(理学部), 教授 (00181298)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | グラフェン / グラファイト / ジグザグ端状態 / スピン偏極ジグザグ端状態 / 走査トンネル顕微/分光法 / 電気伝導度測定 / 電気輸送特性 |
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| Outline of Final Research Achievements |
A technique to create hexagonal nanopits with atomically precise zigzag edges on graphite surfaces and graphene by hydrogen-plasma etching was developed through this research project. The study of the local density of states around such zigzag edges on an atomic scale prevails the relation between two states at the Dirac point, i.e., the electronic state localized around zigzag edges and the 0th Landau level in the bulk. Moreover, the spin polarized state which is expected around zigzag edges of a graphene nano-robbon was successfully shown unambiguously. Such atomic scale properties were also confirmed in the electronic transport properties of ultra-thin graphites with either circular or hexagonal nanopits. Weak localization due to the defects or the irregular edges did not appear for samples with hexagonal nanopits because the inter-valley scattering is suppressed at zigzag edges.
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Report
(4 results)
Research Products
(17 results)
