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arXiv 2005.01493cond-mat.mes-hall
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石墨烯中的自旋流体动力学产生

Spin hydrodynamic generation in graphene

Mamoru Matsuo, Denis A. Bandurin, Yuichi Ohnuma, Yasumasa Tsutsumi, Sadamichi Maekawa

摘要:

石墨烯具有超净电子系统,其中电子-电子碰撞是液氮温度以上散射的主要来源。在这种情况下,电子流体的运动类似于具有高粘度的经典液体和气体的流动。在这里,我们表明,这种粘性的电子流可以导致产生的自旋电流垂直于流动的方向。结合纳维-斯托克斯方程和自旋-涡度耦合下的自旋扩散方程,导出了一个纯粘性电子流引起的自旋积累的表达式。我们探讨Poiffille流和Jeffery-Hamel流,并表明自旋霍尔角可能超过0.1在很宽的温度范围内,可以控制载流子密度,温度和样品边界的几何形状。我们的理论指出了石墨烯作为自旋电流源的新功能。

英文摘要:

Graphene hosts an ultra-clean electronic system with electron-electron collisions being the dominant source of scattering above liquid nitrogen temperatures. In this regime, the motion of the electron fluid resembles the flow of classical liquids and gases with high viscosity. Here we show that such a viscous electron flow can cause the generation of a spin current perpendicular to the direction of flow. Combining the Navier-Stokes equations and the spin diffusion equation in the presence of the spin-vorticity coupling, we derive an expression for the spin accumulation emerging purely as a result of the viscous electron flow. We explore Poiseuille flow and Jeffery-Hamel flow and show that the spin Hall angle may exceed 0.1 over a wide range of temperatures and can be controlled by carrier density, temperature, and the geometry of sample boundaries. Our theory points to new functionality of graphene as a spin current source.

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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