摘要
通过线性化量子流体动力学模型(Quantum hydrodynamic model QHD),探究了黏滞效应对带电粒子与双层二维电子气相互作用过程的影响。与Poisson方程相结合,推导出电子气密度、感应电势、阻止力和侧向力积分表达式。模拟结果表明,在入射粒子速度一定时,随着黏滞系数的增大,2个平面内的电子气密度振荡的区域和幅值均变小。此外,对于阻止力随速度的变化情况,在速度小于波尔速度时,黏滞效应使阻止力变大,在速度较高时却使阻止力变小。对于侧向力,在速度较低区域,黏滞系数越大,侧向力越小,当速度增大到波尔速度的1.5倍时,黏滞效应对侧向力的影响逐渐消失。
The viscous effect on the electrostatic excitation state of charged particles interacting with double layer tow-dimensional electron gases was studied using a linearized quantum hydrodynamic model(QHD).By com⁃bining with the Poisson equation,the integral expressions for the induced electron gas density,the induced potential,the stopping force and lateral force are derived.The simulation results indicate that the oscillation region and ampli⁃tude of electron density in both planes decrease with the increasing of viscosity coefficient for a given incident parti⁃cle velocity.In addition,for the variation of the stopping force with the velocity,the viscous effect increases the stop⁃ping force when the velocity is less than the Bohr velocity,but decreases when the velocity is higher.For lateral force,however,in the lower velocity region,the larger the viscosity coefficient,the smaller the lateral force.When the velocity increases to one and half the Bohr velocity,the effect of viscosity on lateral force decreases and then disappears gradually.
作者
史欣如
李春芝
SHI Xinru;LI Chunzhi(College of Physics and Electronic Information,Inner Mongolia Minzu University,Tongliao 028043,China)
出处
《内蒙古民族大学学报（自然科学版）》
2024年第2期91-96,共6页
Journal of Inner Mongolia Minzu University：Natural Sciences
基金
内蒙古自治区高校科研项目(NJZY23098)
内蒙古自治区自然科学基金项目(2023LHMS06026)。
关键词
QHD模型
双层二维电子气
黏滞效应
静电激发
quantum hydrodynamic model
double layered graphene
viscous effect
electrostatic excitation
