| Budget Amount *help |
¥27,040,000 (Direct Cost: ¥20,800,000、Indirect Cost: ¥6,240,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
Fiscal Year 2012: ¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
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| 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.
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