悬浮单层石墨烯中电子输运的蒙特卡罗研究

R. Rengel, C. Couso, M. J. Martín
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引用次数: 12

摘要

对悬浮单层石墨烯中的电子输运进行了微观研究。结果是通过考虑石墨烯带结构的主要物理性质和这种材料最相关的散射机制的集成蒙特卡罗模拟器获得的。载流子速度值主要由光和声谷间声子的主导影响决定,特别是在高电场下,观察到负差分电导。散射平均间隔时间随外加电场的增大呈渐近趋势,其值约为ps的十分之一。分析了电场对波矢量分布的影响,发现随着平均能量的线性增加,电荷质心的位移呈饱和趋势。最后,对瞬时速度和速度波动的相关函数进行了研究。
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A Monte Carlo Study of electron transport in suspended monolayer graphene
A microscopic study of electronic transport in suspended monolayer graphene is presented. The results have been obtained by means of an ensemble Monte Carlo simulator that takes into account the main physical properties of the graphene bandstructure and the most relevant scattering mechanisms for this type of material. The carrier velocity value is mainly set by the dominant influence of optical and acoustic intervalley phonons, particularly at high electric fields, where a negative differential conductance is observed. The average time between scatterings shows an asymptotic behavior with the applied electric field, with values in the order of tenths of ps. The influence of the electric field on the wavevector distribution is also analyzed, showing a saturation trend in the displacement of the charge centroid with a linear increase in the average energy. Finally, the instantaneous velocity and the correlation function of velocity fluctuations are also studied.
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