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Exciton physics in 1D-2D heterostructures

Research Project

Project/Area Number 19K23593
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0402:Nano/micro science, applied condensed matter physics, applied physics and engineering, and related fields
Research InstitutionInstitute of Physical and Chemical Research

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)

Project Period (FY) 2019-08-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
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)
Keywordscarbon nanotube / hexagonal boron nitride / exciton / screening effect / carbon nanotubes / 2D materials / heterostructure / excitons
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.

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.

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.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2021 2020

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Deterministic transfer of optical-quality carbon nanotubes for atomically defined technology2021

    • Author(s)
      Otsuka Keigo、Fang Nan、Yamashita Daiki、Taniguchi Takashi、Watanabe Kenji、Kato Yuichiro K.
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 1-8

    • DOI

      10.1038/s41467-021-23413-4

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Hexagonal Boron Nitride As an Ideal Substrate for Carbon Nanotube Photonics2020

    • Author(s)
      N. Fang, K. Otsuka, A. Ishii, T. Taniguchi, K. Watanabe, K. Nagashio, and Y. K. Kato
    • Journal Title

      ACS Photonics

      Volume: 7 Issue: 7 Pages: 1773-1779

    • DOI

      10.1021/acsphotonics.0c00406

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Excitons in mixed-dimensional heterostructures2021

    • Author(s)
      Fang Nan
    • Organizer
      「物質階層原理研究」&「ヘテロ界面研究」 2021年冬合同研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Dielectric screening effects on photoluminescence of carbon nanotubes on hexagonal boron nitride2020

    • Author(s)
      N. Fang, K. Otsuka, T. Taniguchi, K. Watanabe, K. Nagashio, Y. K. Kato,
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Dielectric screening effects on photoluminescence of carbon nanotubes on hexagonal boron nitride2020

    • Author(s)
      N. Fang, K. Otsuka, T. Taniguchi, K. Watanabe, K. Nagashio, Y. K. Kato,
    • Organizer
      The 58th Fullerenes-Nanotubes-Graphene General Symposium
    • Related Report
      2019 Research-status Report
  • [Presentation] Hexagonal boron nitride as an ideal substrate for carbon nanotube photonics2020

    • Author(s)
      N. Fang, K. Otsuka, A. Ishii, T. Taniguchi, K. Watanabe, K. Nagashio, Y. K. Kato,
    • Organizer
      8th Workshop on Nanotube Optics and Nanospectroscopy
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Dielectric screening effects on photoluminescence of carbon nanotubes on hexagonal boron nitride2020

    • Author(s)
      N. Fang, K. Otsuka, T. Taniguchi, K. Watanabe, K. Nagashio, Y. K. Kato,
    • Organizer
      PKU-Tsinghua-UTokyo Workshop on Nano Research
    • Related Report
      2019 Research-status Report

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Published: 2019-09-03   Modified: 2023-01-30  

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