【摘要】 采用线性化量子流体动力学模型,研究了载能粒子在二维电子气平面与半无限大绝缘基底之间运动时的静电激发现象.与Poisson方程相结合,在恰当的边界条件下推导出粒子平行于电子气平面运动时的感应电子气密度、阻止力和侧向力的一般表达式.结果表明,基底的介电常数和电子气平面与基底间的距离对感应电子气密度的扰动波长、入射粒子所受的阻止力和侧向力有较大影响,尤其当速度较大时对两个力影响十分明显.更多还原

【Abstract】 The electronic excitation induced by charged particle moving between two-dimensional electron gases(2 DEGs)and a half infinite insulating substrate was investigated using a linearized quantum hydrodynamic(QHD)model. Combined with Poisson equation, general expressions of the induced density of the electron gases,the stopping and image forces acting on incident particle were obtained by selecting the appropriate boundary conditions. The results show that the dielectric constant and the distance between the electron gases and substrate influence the oscillatory wavelength of perturbed electron gases density, the stopping force and image force. The influence will be obvious on both forces at higher speed.更多还原