Nonlinear transport and heat dissipation in metallic carbon nanotubes
Nonlinear transport and heat dissipation in metallic carbon nanotubes
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DOI：
10.1103/physrevlett.95.266803
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发表时间：
2005-12-31
影响因子：
8.6
通讯作者：
Leburton, JP
中科院分区：
文献类型：
--
作者：
Kuroda, MA;Cangellaris, A;Leburton, JP
研究表明，沿金属碳纳米管热化电子和声子居群的局部温度依赖性是高偏置区非线性输运特性背后的主要原因。我们的模型基于玻尔兹曼输运方程的解，考虑了光学和区边界声子发射以及载流子的吸收。它还假设沿纳米管的局部温度，由热传递方程自一致地确定。通过使用真实的输运参数，我们的结果不仅再现了电子输运的实验数据，而且提供了电应力下热击穿的连贯解释。特别是，电子和声子热化阻止了短纳米管中的弹道输运。
We show that the local temperature dependence of thermalized electron and phonon populations along metallic carbon nanotubes is the main reason behind the nonlinear transport characteristics in the high bias regime. Our model is based on the solution of the Boltzmann transport equation considering both optical and zone boundary phonon emission as well as absorption by charge carriers. It also assumes a local temperature along the nanotube, determined self-consistently with the heat transport equation. By using realistic transport parameters, our results not only reproduce experimental data for electronic transport but also provide a coherent interpretation of thermal breakdown under electric stress. In particular, electron and phonon thermalization prohibits ballistic transport in short nanotubes.