| 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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| 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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