论文标题
石墨烯中的自旋流体动力产生
Spin hydrodynamic generation in graphene
论文作者
论文摘要
石墨烯具有一个超清洁的电子系统，具有电子电子碰撞是液氮温度以上散射的主要来源。在这种方案中，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，我们表明这种粘性电子流可以导致垂直于流动方向的旋转电流产生。在存在自旋涡流耦合的情况下，结合Navier-Stokes方程和自旋扩散方程，我们从粘性电子流中纯粹出现了自旋积累的表达式。我们探索Poiseuille流量和Jeffery Hamel流量，并表明在广泛的温度范围内，旋转厅角可能超过0.1，并且可以通过载体密度，温度和样品边界的几何形状来控制。我们的理论指出石墨烯是自旋电流源的新功能。
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.
