Are deformed modes still Raman active for single-wall carbon nanotubes?

作者：Yang Wei; Wang Ru Zhi^*; Wang Yu Fang; Yan Hui

来源：Physica B: Condensed Matter , 2008, 403(18): 3009-3012.

DOI：10.1016/j.physb.2008.03.006

• Raman active
• symmetry
• correlation
• single-wall carbon nanotubes (SWCNTs)
• hydrostatic pressure

Using group theory calculations combined with the force-constant model and molecular-dynamics simulations, whether the deformed modes are Raman active or not for (10,10) and (10,0) single-wall carbon nanotubes under hydrostatic pressure is discussed. With increasing pressure, the tube symmetry lowers from D-20h to D-2h then to C-2h point group. For D-20h, A(1g) is changed to A(g), while E-1g and E-2g are split: E-1g -> B-2g + B-3g -> 2(Bg) and E-2g -> A(g) + B-1g -> 2A(g). On the basis of the correlation between D-20h, D-2h, and C-2h point groups, the deformed modes should be still Raman active. The result can help us clarify the essence of the experimental observations.

• 出版日期2008-9-1
• 单位北京工业大学; 南开大学