Center for Soft Condensed Matter Physics and Interdisciplinary Research, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, China.
Department of Computational Mathematics, Science and Engineering, Michigan State University, East Lansing, Michigan 48824, USA.
Phys Rev E. 2017 Nov;96(5-1):053208. doi: 10.1103/PhysRevE.96.053208. Epub 2017 Nov 28.
Transport properties of two-dimensional (2D) strongly coupled dusty plasmas have been investigated in detail, but never for viscosity with a strong perpendicular magnetic field; here, we examine this scenario using Langevin dynamics simulations of 2D liquids with a binary Yukawa interparticle interaction. The shear viscosity η of 2D liquid dusty plasma is estimated from the simulation data using the Green-Kubo relation, which is the integration of the shear stress autocorrelation function. It is found that, when a perpendicular magnetic field is applied, the shear viscosity of 2D liquid dusty plasma is modified substantially. When the magnetic field is increased, its viscosity increases at low temperatures, while at high temperatures its viscosity diminishes. It is determined that these different variational trends of η arise from the different behaviors of the kinetic and potential parts of the shear stress under external magnetic fields.
二维（2D）强耦合尘埃等离子体的输运性质已被详细研究，但从未涉及过存在强垂直磁场时的粘性；在这里，我们使用具有二元 Yukawa 粒子间相互作用的二维液体的朗之万动力学模拟来研究这种情况。通过格林-库伯关系（即剪切应力自相关函数的积分）从模拟数据中估算出二维液体尘粒等离子体的剪切粘度 η。结果发现，当施加垂直磁场时，二维液体尘粒等离子体的剪切粘度会发生显著变化。随着磁场的增加，其粘度在低温下增加，而在高温下则减小。确定 η 的这些不同变化趋势源于剪切应力的动能和势能部分在外磁场下的不同行为。
