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arXiv 1006.4306cond-mat.mes-hall
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石墨烯导电性中短程和长程散射的影响:Boltzmann方法与紧束缚计算

Effect of short- and long-range scattering in the conductivity of graphene: Boltzmann approach vs tight-binding calculations

J. W. Klos, I. V. Zozoulenko

摘要:

我们提出了一个比较研究的密度依赖性的石墨烯片的导电性计算的紧束缚(TB)Landauer方法和玻尔兹曼理论的基础上。TB计算发现,给相同的密度依赖性的电导率,$σ\sim n$,短程和长程高斯散射体。在短程散射的情况下,TB计算与超出玻尔兹曼近似的玻尔兹曼理论的预测一致,但在定性和定量上与玻尔兹曼近似内的标准玻尔兹曼方法不一致,预测$σ= $常数。即使是长期的-范围高斯势在对应于现实系统的参数范围内,标准玻尔兹曼预测是定量和定性的不同意TB结果。这质疑玻尔兹曼方法在玻恩近似中的适用性,玻尔兹曼近似通常用于解释石墨烯中传输的实验研究结果。

英文摘要:

We present a comparative study of the density dependence of the conductivity of graphene sheets calculated in the tight-binding (TB) Landauer approach and on the basis of the Boltzmann theory. The TB calculations are found to give the same density dependence of the conductivity, $σ\sim n$, for short-range and long-range Gaussian scatterers. In the case of short-range scattering the TB calculations are in agreement with the predictions of the Boltzmann theory going beyond the Born approximation, but in qualitative and quantitative disagreement with the standard Boltzmann approach within the Born approximation, predicting $σ= $ const. Even for the long-range Gaussian potential in a parameter range corresponding to realistic systems the standard Boltzmann predictions are in quantitative and qualitative disagreement with the TB results. This questions the applicability of the standard Boltzmann approach within the Born approximation, commonly used for the interpretation of the results of experimental studies of the transport in graphene.

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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