点击次数：

论文类型：期刊论文

发表时间：2015-09-01

发表刊物：SURFACE SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：639

页面范围：32-38

ISSN号：0039-6028

关键字：Wake potential; Stopping power; Image potential; Metal surface; Rough surface

摘要：We use the Green function formulation of a dielectric response formalism to study the dynamic polarization of a rough metal surface by a single charged particle and by a pair of charged particles that move parallel to the surface. While the surface roughness is treated nonperturbatively, the plasmon excitation of the metal electron gas is described locally. We find that the magnitudes of both the image potential and the stopping power of a single particle are increased by the increasing roughness and decreasing correlation length of the surface. On the other hand, both the long-range wake potential of a single charged particle and the interaction potential between two particles are weakly affected by the surface roughness. However, the strongest effects of the surface roughness are seen in the correlated stopping power of two charged particles, giving rise to oscillations in the dependence of the stopping ratio on their distance, both when the interparticle axis is perpendicular to their direction of motion and when the wake-related oscillations are damped by adiabatic suppression of plasmon excitations at low particle speeds. (C) 2015 Elsevier B.V. All rights reserved.