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。对拉曼信号的共振条件进行了扩展紧束缚计算，得到了相对较小(直径小于1 nm)纳米管的精确共振能量。2.计算了电子-光子相互作用矩阵元素，发现在二维石墨布里渊区K点附近有矩阵元素的值。3.电子-声子相互作用矩阵元素也由紧束缚方案给出，并计算了相应的拉曼强度作为单壁碳纳米管(n，m)的函数。4.无序诱导拉曼信号由双共振拉曼信号指定。在石墨和碳纳米管中，我们已经知道了许多很长时间没有被指定的微弱的拉曼信号。单声子和双声子过程中双共振层的发现在拉曼光谱学史上具有非常重要的意义。5.发现(6，5)纳米管的光致发光光谱是许多不同的过程，可以结合理论分别进行指认。6.通过电子-声子相互作用计算了光激发电子-空穴对的驰豫时间。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.