Phonons and Electron-Phonon Scattering in Carbon Nanotubes
Phonons and Electron-Phonon Scattering in Carbon Nanotubes
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DOI：
10.1103/physrevb.65.235412
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发表时间：
2002-05
影响因子：
3.7
通讯作者：
H. Suzuura;T. Ando
中科院分区：
文献类型：
--
作者：
H. Suzuura;T. Ando
用有效质量理论研究了电子-声子散射。引入了声学声子的连续介质模型，导出了由能带结构变化引起的电子-声子相互作用以及法向形变势。在金属纳米管中，变形势不参与电子散射，即使在室温下，金属纳米管也几乎成为一维弹道导体。由小能带-结构相互作用决定的电阻率取决于低温下的手性。垂直于轴的磁场通过形变势诱导电子散射，产生巨大的正磁阻。
Electron-phonon scattering is studied within an effective-mass theory. A continuum model for acoustic phonons is introduced and electron-phonon interaction due to modification of band structure is derived as well as a normal deformation potential. In a metallic nanotube, the deformation potential does not participate in electron scattering and a metallic nanotube becomes nearly a one-dimensional ballistic conductor even at room temperature. A resistivity determined by small band-structure interaction depends on the chirality at low temperatures. A magnetic field perpendicular to the axis induces electron scattering by the deformation potential, giving rise to huge positive magnetoresistance.