Softening of the Radial Breathing Mode in Metallic Carbon Nanotubes

作     者：H. Farhat K. Sasaki M. Kalbac M. Hofmann R. Saito M. S. Dresselhaus J. Kong 

作者机构：Department of Materials Science and Engineering MIT Cambridge Massachusetts 02139 USA Department of Quantum Matter Graduate School of Advanced Sciences of Matter Hiroshima University Higashi-Hiroshima 739-8530 Japan J. Heyrovský Institute of Physical Chemistry Academy of Sciences of the Czech Republic V.V.i. Dolejskova 3 CZ-18223 Prague 8 Czech Republic Department of Electrical Engineering and Computer Science MIT Cambridge Massachusetts 02139 USA Department of Physics Tohoku University Sendai 980-8578 Japan Department of Physics MIT Cambridge Massachusetts 02139 USA 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2009年第102卷第12期

页      面：126804-126804页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Materials, Structure and Devices (MSD) Center NSF-CHE NIH [RR02594] NSF/DMR [07-04197] MEXT [20241023, 16076201] Division Of Chemistry Direct For Mathematical & Physical Scien Funding Source: National Science Foundation Grants-in-Aid for Scientific Research Funding Source: KAKEN 

主　　题：Single walled carbon nanotubes (SWCN) 

摘      要：The softening of the radial breathing mode (RBM) of metallic single walled carbon nanotubes (m-SWNTs) due to electron-phonon coupling has been studied by observing the Fermi level (ϵF) dependence of the RBM Raman peak. In situ Raman spectra were obtained from several individual m-SWNTs while varying ϵF electrochemically. The RBM frequency of an intrinsic m-SWNT is shown to be down-shifted relative to highly doped tubes by ∼2 cm−1. The down-shift is greatest for small diameter and small chiral angle SWNTs. Most tubes show no change in RBM linewidth. A comparison is drawn between the RBM and the G band (ALO phonon) with respect to the ϵF dependence of their frequencies and linewidths.