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arXiv 1807.08403cond-mat.mes-hall
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半导体碳纳米管中的双极thermoelectric effects:一维狄拉克电子描述

Bipolar thermoelectric effects in semiconducting carbon nanotubes: Description in terms of one-dimensional Dirac electrons

Takahiro Yamamoto, Hidetoshi Fukuyama

摘要:

基于线性响应理论结合热格林函数方法研究了半导体单壁碳纳米管(SWCNTs)的热电效应。结果表明,附近的最低的导带最低和最高的价带最大的电子状态可以有效地描述在一维(1D)狄拉克电子的理论方案来描述的热电响应,使之有可能研究带间杂质散射和带隙状态的影响。使用所提出的方案,双极热电效应(即,Seebeck系数的符号反转)的半导体单壁碳纳米管在最近的实验中观察到的解释。此外,半导体单壁碳纳米管在低温下的塞贝克系数的温度依赖性是明确的。

英文摘要:

The thermoelectric effects in semiconducting single-walled carbon nanotubes (SWCNTs) are investigated based on the linear response theory combined with the thermal Green's function method. It is shown that the electronic states near the lowest conduction band minimum and the highest valence band maximum can be effectively described in terms of one-dimensional (1D) Dirac electrons to which a theoretical scheme is developed to describe the thermoelectric responses making it possible to study the effects of inter-band impurity scattering and in-gap states. Using the proposed scheme, the bipolar thermoelectric effects (i.e., the sign inversion of the Seebeck coefficient) in semiconducting SWCNTs observed in recent experiments are explained. Moreover, the temperature dependence of the Seebeck coefficient of semiconducting SWCNTs at low temperature is clarified.

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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