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...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。展开更多
It has been known that the static polarizability of a polymer chain with a biexciton is negative. In order to understand this peculiar fact, this paper studies the dynamical process of the charge transfer in the polym...It has been known that the static polarizability of a polymer chain with a biexciton is negative. In order to understand this peculiar fact, this paper studies the dynamical process of the charge transfer in the polymer chain induced by an external electric held E during forming the biexciton. The time dependence of the charge distribution in the chain reveals that the charge transfer is backward: the positive charge shifts in the opposite direction of the external electric field. Such a backward charge transfer (BCT) produces an opposite dipole, which makes the polarization negative. The effect of electron interaction on the BCT is illustrated.展开更多
文摘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。
文摘It has been known that the static polarizability of a polymer chain with a biexciton is negative. In order to understand this peculiar fact, this paper studies the dynamical process of the charge transfer in the polymer chain induced by an external electric held E during forming the biexciton. The time dependence of the charge distribution in the chain reveals that the charge transfer is backward: the positive charge shifts in the opposite direction of the external electric field. Such a backward charge transfer (BCT) produces an opposite dipole, which makes the polarization negative. The effect of electron interaction on the BCT is illustrated.
