Lattice Dynamics of Potassium-Doped Single-Walled Carbon Nanotubes
XIAO Yang1, YAN Xiao-Hong1,2, CAO Jue-Xian1, MAO Yu-Liang1, DENG Yu-Xiang1, DING Jian-Wen1
1Department of Physics and Institute of Modern Physics, Xiangtan University, Xiangtan 411105
2Interdisciplinary Center of Theoretical Studies and Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080
Lattice Dynamics of Potassium-Doped Single-Walled Carbon Nanotubes
1Department of Physics and Institute of Modern Physics, Xiangtan University, Xiangtan 411105
2Interdisciplinary Center of Theoretical Studies and Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080
Abstract： We calculate the vibrational properties of potassium-doped single-walled carbon nanotubes within lattice dynamical theory. The results show that the frequency of high-frequency Raman mode E2g for K5C40 downshifts to 1553 cm-1, which is in agreement with the value for highly doped samples with effective composition KC8. Moreover, the specific heat curves have a turnover at 22 K, originating from the saturation of K atoms vibrational modes at low energy.
2004, Vol. 21 
