arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.14432cond-mat.mes-hallcond-mat.mtrl-scicond-mat.stat-mechcond-mat.str-elphysics.flu-dyn
收藏

中性石墨烯中的反Poiffille流动

Anti-Poiseuille flow in neutral graphene

B. N. Narozhny, I. V. Gornyi, M. Titov

摘要:

石墨烯中载流子的流体动力学流动是一种能量流动,不同于常规流体中的通常质量流动。在中性石墨烯中,能量流与电流解耦,使得难以观察流体动力学效应并通过电流测量来测量电子流体的粘度。特别是,我们表明,标志Poiffille流在一个狭窄的通道不能驱动的电场,无论在通道边缘的边界条件。然而,可以观察到不均匀的电流密度,类似于众所周知的弹道扩散交叉的情况。在通道边界上的镜面散射的假设下,实现了具有均匀电流密度的标准扩散行为。通过施加弱磁场也可以使这种流动不均匀。在这种情况下,电流密度分布的曲率由无序辅助的电子-声子散射主导的准粒子复合过程-所谓的超碰撞决定。

英文摘要:

Hydrodynamic flow of charge carriers in graphene is an energy flow unlike the usual mass flow in conventional fluids. In neutral graphene, the energy flow is decoupled from the electric current, making it difficult to observe the hydrodynamic effects and measure the viscosity of the electronic fluid by means of electric current measurements. In particular, we show that the hallmark Poiseuille flow in a narrow channel cannot be driven by the electric field irrespective of boundary conditions at the channel edges. Nevertheless one can observe nonuniform current densities similarly to the case of the well-known ballistic-diffusive crossover. The standard diffusive behavior with the uniform current density across the channel is achieved under the assumptions of specular scattering on the channel boundaries. This flow can also be made nonuniform by applying weak magnetic fields. In this case, the curvature of the current density profile is determined by the quasiparticle recombination processes dominated by the disorder-assisted electron-phonon scattering -- the so-called supercollisions.

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。

↑