arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0706.0140cond-mat.mtrl-scicond-mat.mes-hall
收藏

量子电导中电子粘性的处理

Treatment of electron viscosity in quantum conductance

J. Jung, P. Bokes, R. W. Godby

摘要:

在最近的一篇论文中,Sai { \it et al.} [1]确定了对纳米级结的DC电导的校正$R^{dyn}$,所述纳米级结由时间依赖密度泛函理论内的动态交换相关($XC$)效应引起。该数量通过$R=R_{s}+R^{dyn}$对总阻力有贡献,其中$R_{s}$是在不存在动态$XC$效应的情况下评价的阻力。在这篇评论中,我们表明,数值估计的$R^{dyn}$在示例系统的类型,他们认为应大大减少,一旦一个更合适的形式的剪切电子粘度$η$使用。

英文摘要:

In a recent paper Sai {\it et al.} [1] identified a correction $R^{dyn}$ to the DC conductance of nanoscale junctions arising from dynamical exchange-correlation ($XC$) effects within time-dependent density functional theory. This quantity contributes to the total resistance through $R=R_{s}+R^{dyn}$ where $R_{s}$ is the resistance evaluated in the absence of dynamical $XC$ effects. In this Comment we show that the numerical estimation of $R^{dyn}$ in example systems of the type they considered should be considerably reduced, once a more appropriate form for the shear electron viscosity $η$ is used.

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。

↑