Resonant Coherent Phonon Generation in Single-Walled Carbon Nanotubes through Near-Band-Edge Excitation

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• 作者：Yong-Sik Lim ; Jae-Geum Ahn ; Ji-Hee Kim ; Ki-Ju Yee ; Taiha Joo ; Sung-Hoon Baik ; Erik H. Hároz ; Layla G. Booshehri ; Junichiro Kono
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：June 22, 2010
• 年：2010
• 卷：4
• 期：6
• 页码：3222-3226
• 全文大小：330K
• 年卷期：0
• ISSN：1936-086X

文摘

We have observed large-amplitude coherent phonon oscillations of radial breathing modes (RBMs) in single-walled carbon nanotubes excited through the lowest-energy (E₁₁) interband transitions. In contrast to the previously studied coherent phonons excited through higher-energy (E₂₂) transitions, these RBMs show comparable intensities between (n−m) mod 3 = +1 and −1 nanotubes. We also find the novel observation of RBMs excited over an excitation range of ∼300 meV above the E₁₁ transition, which we attribute to possible resonance with phonon sidebands of the lowest optical transition, arising from strong exciton−phonon coupling.