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arXiv 1908.09461cond-mat.mtrl-scicond-mat.mes-hallphysics.comp-ph
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一维碳纳米管结构的热输运

Thermal transports of one-dimensional ultrathin carbon structures

Jing Xue, Yuee Xie1, Qing Peng, Yuanping Chen

摘要:

碳原子链、线性苯聚合物和碳纳米线都是一维(1D)碳纳米结构。它们具有优异的电子和机械性能,然而,它们的热输运性质很少被探索。本文采用非平衡格林函数和力场相结合的方法,系统地研究了它们的热导率。在300 K时,热导率在0.24 ~ 1.00 nW/K之间变化,线性苯聚合物和碳纳米线中的声子输运强烈依赖于苯环之间的连接方式.我们提出了一个简单的一维模型,即力常数模型,解释了这些结构中复杂的输运过程。我们的研究不仅揭示了这些碳结构中声子输运的内在机制,而且为分析其他由几个原子链组成的一维碳结构的热性质提供了一种有效的方法。

英文摘要:

Carbon atomic chain, linear benzene polymers, and carbon nanothreads are all one-dimensional (1D) ultrathin carbon structures. They possess excellent electronic and mechanical properties; however, their thermal transport properties have been rarely explored. Here, we systematically study their thermal conductance by combining the nonequilibrium Green's function and force field methods. The thermal conductance varies from 0.24 to 1.00 nW/K at 300 K, and phonon transport in the linear benzene polymers and carbon nanothreads is strongly dependent on the connectivity styles between the benzene rings. We propose a simple 1D model, namely force-constant model, that explains the complicated transport processes in these structures. Our study not only reveals intrinsic mechanisms of phonon transport in these carbon structures, but also provides an effective method to analyze thermal properties of other 1D ultrathin structures made of only several atomic chains.

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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