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arXiv 0807.4212cond-mat.mes-hallcond-mat.stat-mech
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对称破缺碳纳米管中的单模声子传输

Single-mode phonon transmission in symmetry broken carbon nanotubes

Jian Wang, Jian-Sheng Wang

摘要:

利用模式匹配方法和对称性分析,研究了存在Stone-Wales(SW)缺陷的碳纳米管中的简正模声子传输。计算表明,在高频范围内,低群速声学声子的透射率明显降低,这种SW缺陷引起的对称性破缺对长波光学声子在碳纳米管中的透射率有很强的抑制作用.每个声子模的传输特性取决于对称性。这些结果表明,在缺陷的纳米管的局部加热可能主要是由低群速度的声学声子和光学声子附近的$Γ$点。

英文摘要:

Normal mode phonon transmissions are studied in carbon nanotubes with the presence of Stone-Wales (SW) defect, using a mode-matching method and through the analysis of symmetry. The calculation shows that the transmission for low group velocity acoustic phonons is evidently reduced at high frequency range, and that this SW defect induced symmetry breaking strongly inhibits the transmission of long wave optical phonons in carbon nanotubes. The characteristic features of transmission for each phonon mode depend on the symmetry. These findings suggest that the local heating in the defective nanotubes may be contributed mainly from the low group velocity acoustic phonons and optical phonons near the $Γ$-point.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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