Application to nano-techonology and resonance Raman spectroscopy of carbon nanotubes

1.定量研究了单壁碳纳米管的共振拉曼光谱。利用扩展的紧束缚计算方法计算了拉曼信号的共振条件，使得在相对较小的共振能量下，（直径小于1nm）纳米管。计算了光子相互作用矩阵元，发现在二维石墨布里渊区中，矩阵元的值在K点附近有节点方案，并计算了单壁碳纳米管的拉曼强度随（n，m）的变化关系。4.将无序诱导的拉曼信号归属于双共振拉曼信号。在石墨和碳纳米管中，我们已经发现了许多微弱的拉曼信号，这些信号多年来一直没有被归属。发现了单声子和双声子的双共振故事，这在拉曼光谱学的发展史上具有重要意义。5.发现（6，5）纳米管的光致发光光谱是多种不同的过程，结合理论可以分别归属。研究了它在快速光学中的应用。

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.