| Project/Area Number |
20K15120
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 28020:Nanostructural physics-related
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
FANG NAN 国立研究開発法人理化学研究所, 開拓研究本部, 基礎科学特別研究員 (50850509)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | carbon nanotube / hexagonal boron nitride / tungsten diselenide / exciton / carbon nanotubes / 2D materials / heterostructure / excitons / cavity / dielectric screening |
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| Outline of Research at the Start |
Interlayer excitons will be explored in 2D-1D van der Waals heterostructures. Emission wavelength of the interlayer excitons will be modulated by choosing different 2D materials. Novel photonic devices such as excitonic transistors and photodiodes will be developed based on the interlayer excitons.
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| Outline of Final Research Achievements |
Hexagonal boron nitride (h-BN), a two-dimensional (2D) material, is atomically flat with low defect density, which is widely used to support other 2D materials for both electronics and photonics. We expect that the advantages of h-BN can also be utilized in mixed dimensional heterostructures, and carbon nanotubes (CNTs) would provide a unique opportunity in this context. The one-dimensional nature of CNTs results in enhanced Coulomb interactions, giving rise to tightly bound excitons that show photoluminescence (PL) at room temperature. CNTs directly attached on solid-state substrates such as SiO2/Si, however, suffers from the strong substrate quenching effect, hindering applications in all-solid-state optical devices. By using h-BN as a substrate, the quenching effect is expected to be suppressed. Moreover, we also investigate the interaction between CNTs and tungsten diselenide, and find a clear exciton transfer in this system.
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| Academic Significance and Societal Importance of the Research Achievements |
These findings indicate that h-BN is an ideal solid-state subsatrate for the CNTs photonic devices and open a new path-way for manipulating excitons in CNTs.Moreover, a strong exciton transfer between WSe2 and CNTs reveal novel excitonic physics in mixed dimensional heterostructures.
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