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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Coherent Phonon Oscillations in Single-Chirality (6,5) SWNT

2014년 8월 28일 16시 58분 02초
PHYS.P-467 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
윤은진, 주태하*
포항공과대학교(POSTECH) 화학과, Korea
Single-walled carbon nanotubes (SWNTs) are standards for ideal one-dimensional system in both scientific research and industrial applications. Optical properties of SWNTs, in particular, have been of a great interest as a non-invasive non-contacting approach since the discovery of suspended SWNTs [1]. With pump/probe transient absorption techinique (TA), the assignment of chirality of SWNTs was available by the frequencies of the radial breathing modes (RBM) excited by the E22 excitation [2]. Coherent phonon wavepackets are created by impulsive excitation and their motions can be recorded in a probe pulse in a pump/probe transient absorption (TA) experiment.
Here, we report the features of coherent phonon oscillations of (6,5) single chiral SWNTs at room temperature with TA experiments in the E11 and E22 optical regions. The E11 resonant excitation allows the direct observation of many vibrational modes. For the E11 excitation, RBM is excited by coherent superposition between the ground state and the first excited state. And it is remarkably different from for E22 excitation, which probes exclusively the ground state since the lifetime of the E22 state is rather short (~100 fs). It supports that the excitonic picture should be account for the E11 excitation.

1. Reigh, S; Thomsen, C.; Maulzsch, J. Carbon Nanotubes :Basic Concepts and Physical Properties; Wiley-VCH: Berlin, 2004
2. Lim, Y.S.; Yee, K. J.; Kim, J. H.; Haroz, E. H.; Shaver, J.; Kono, J.; Doorn, S. K.; Hauge, R. H.; Smalley, R. E. Nano Lett.2006, 6, 2696