Electronic and mechanical coupling between guest and host in carbon peapods

被引:46
作者
Pfeiffer, R
Kuzmany, H
Pichler, T
Kataura, H
Achiba, Y
Melle-Franco, M
Zerbetto, F
机构
[1] Univ Vienna, Inst Mat Phys, A-1090 Vienna, Austria
[2] Inst Festkorper & Werkstofforsch, D-01069 Dresden, Germany
[3] Tokyo Metropolitan Univ, Tokyo 1920397, Japan
[4] Univ Bologna, Dipartimento Chim G Ciamician, I-40126 Bologna, Italy
来源
PHYSICAL REVIEW B | 2004年 / 69卷 / 03期
关键词
D O I
10.1103/PhysRevB.69.035404
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Pristine single-wall carbon nanotubes (SWCNT's) filled with C-60 are investigated with resonance Raman spectroscopy. Both totally symmetric modes of C-60 exhibit a surprising splitting into two components with a slightly different resonance behavior and an apparent loss of polarization. The latter can be understood from a symmetry reduction of the fullerene molecules in the center of the tubes and/or by an anisotropy of the electric field seen by the C-60 peas inside the SWCNT pods due to depolarization effects. The splitting is explained from molecular-dynamics simulations which show that the two bands emerge from a coupling of the C-60 totally symmetric modes to the fullerene translational mobility inside the tube. The doublet is thus the spectroscopic fingerprint of different mobilities of C-60 fullerenes in the tubes.
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页数:7
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