Studies on many-body correlation effects in carbon nanotubes for developing novel optoelectronic devices

2015 Fiscal Year Final Research Report

• Project/Area Number: 24681031
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Microdevices/Nanodevices
• Research Institution: Kyoto University
• Principal Investigator: Miyauchi Yuhei 京都大学, エネルギー理工学研究所, 准教授 (10451791)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: カーボンナノチューブ / 光物性 / レイリー散乱 / キャリアドープ

Outline of Final Research Achievements

Electronic many-body correlation effects in carbon nanotubes were studied by observing broadband Rayleigh scattering from individual suspended carbon nanotubes under electrostatic gating conditions. We found significant shifts in optical transition energies, as well as line broadening, as the carrier density is increased. The observed tunability of the optical resonance could be useful for applications in future optoelectronic devices. We also found brightening of excitons (bound electron-hole pairs) in carbon nanotubes through an artificial modification of their effective dimensionality from 1D to 0D. It was revealed that the luminescence quantum yield of the excitons confined in the 0D-like states can be more than at least one order larger than that of the intrinsic 1D excitons, not only because of the reduced non-radiative decay pathways but also owing to an enhanced radiative recombination probability beyond that of intrinsic 1D excitons.

Free Research Field

ナノ物質科学