Exciton physics in 1D-2D heterostructures
| Project/Area Number |
19K23593
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0402:Nano/micro science, applied condensed matter physics, applied physics and engineering, and related fields
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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) |
2019-08-30 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | carbon nanotube / hexagonal boron nitride / exciton / screening effect / carbon nanotubes / 2D materials / heterostructure / excitons |
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| Outline of Research at the Start |
Interlayer excitons will be studied in 2D-1D vdW heterostructures. These excitons are expected to have unique properties such as a long lifetime, aligned dipole moment, and the broken symmetry. This study opens up the newly unexplored research field focusing on the mixed-dimensional optics.
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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, excitons in CNTs are sensitive to the dielectric environment, and intimate contact with the 2D h-BN substrate could result in large modifications in excitonic energies.
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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, we also observe that intimate contact with the h-BN substrate could result in large modifications in excitonic energies.
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Report
(4 results)
Research Products
(7 results)
