| Project/Area Number |
13440091
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Tohoku University (2003-2004)
The University of Electro-Communications (2001-2002) |
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Principal Investigator |
SAITO Riichiro Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (00178518)
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| Project Period (FY) |
2001 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥8,800,000 (Direct Cost: ¥8,800,000)
Fiscal Year 2004: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2003: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2002: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2001: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Carbon nanotubes / Resonance Raman spectroscopy / Photoluminescence / chirality / Electron-phonon interaction / Double Resonance Raman spectroscopy / D-band / 発光 / 二重共鳴 / 二重共鳴ラマン / フォノン分散関係 / コンビネーションモード / 垂直偏光 / 共鳴ラマン効果 / グラファイト / 0.4nmナノチューブ / G-band / D-band |
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| Research Abstract |
1.Resonance Raman spectroscopy of single wall carbon nanotube is investigated quantitatively. Resonance condition for Raman signal is calculated extended tight binding calculations which enables the precise resonance energies for relatively smaller (diameter is less than 1nm) nanotubes.
2.Electron-photon interaction matrix element is calculated and is found to have node of the value of the matrix element around the K point in two dimensional Brillouin zone of graphite.
3.Electron phonon interaction matrix element is also given by tight binding scheme and corresponding Raman intensity is calculated as a function of (n,m) of single wall carbon nanotubes.
4.Disorder induced Raman signal is assigned by double resonance Raman signals. In the graphite and carbon nanotube, we have known many weak Raman signals which are not assigned for long years. The finding of double resonance story for one-phonon and two-phonon processed are very important in the history of Raman spectroscopy.
5.Photoluminescence spectra of (6,5) nanotube is found to be many different processes which can be separately assigned combined with the theory.
6.The relaxation time of photo-excited electron-hole pair is calculated by electron-phonon interaction calculations. The application to fast optics is investigated.
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