arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.12874cond-mat.mes-hall
收藏

蒙特卡罗方法中的自由飞行步分析。测试用例:石墨烯中的电荷传输

The free flight step analysis in the Monte Carlo Method. Test case: charge transport in graphene

Marco Coco

摘要:

蒙特卡罗方法现在是研究半导体中电荷输运的一种非常成熟的方法。然而,关于分布函数的正确重构存在许多缺点,分布函数必须被限制在$0$和$1$之间。标准的蒙特卡罗方法不能很好地包含泡利不相容原理,数值分布函数超过最大值。为了解决这个问题,人们进行了大量的尝试,最近开发了一种新的DSMC方案来克服这个问题。所有的改进一般都是基于一些近似或计算技术,涉及到分布函数和散射项。只有一个尝试是专门用来适时地改变制定的自由飞行步骤,但仍然缺乏在文献中的理论和计算分析的基础上的自由飞行的修正蒙特卡罗方法。在本文中,我们希望通过深入分析自由飞行步骤到蒙特卡罗模拟的作用,其物理性质和条件,使我们能够保持物理一致性的方法,以满足这样的差距。

英文摘要:

Monte Carlo methods are now a definitively well established methods for studying the transport of charges in semiconductors. A lot of drawbacks are however present about the correct reconstruction of the distribution function, which has to be bounded between $0$ and $1$. The standard Ensemble Monte Carlo method is not able to properly include the Pauli exclusion principle and the numerical distribution functions exceed the maximum value. A lot of attempts were made to solve the problem and recently a new DSMC scheme has been developed to overcome the problem. All the improvements are generally based on some approximations or computational techniques involving the distribution function and the scattering terms. Only an attempt was devoted to opportunely change the formulation of the free flight step but there is still a lack in the literature regarding a both theoretical and computational analysis of corrected Monte Carlo methods based on the free flights. In this paper we would like to fulfill such a gap by analyzing deeper the role of the free flight step into a Monte Carlo simulation, its physical properties and the conditions that allow us to preserve the physical consistency of the method.

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。

↑