Energy loss of charged particles traversing multilayer graphene

被引:3
|
作者
Borka, D. [1 ]
Radovic, I. [1 ]
Vukovic, K. [2 ,3 ]
机构
[1] Univ Belgrade, Vinca Inst Nucl Sci, Atom Phys Lab 040, Belgrade 11001, Serbia
[2] Ctr Promot Sci, Belgrade 11000, Serbia
[3] Univ Belgrade, Vinca Inst Nucl Sci, Radiat Chem & Phys Lab 030, Belgrade 11001, Serbia
关键词
Graphene; Energy loss; Dielectric function; LAYERED ELECTRON-GAS; PLASMONS;
D O I
10.1016/j.nimb.2015.01.057
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We derive a dielectric response model for dynamic polarization of freestanding multilayer graphene induced by an external charged particle moving at an arbitrary angle of incidence. Using a two-dimensional, two-fluid hydrodynamic model for the single-layer polarizability, we evaluate the probability density for energy loss and the total energy loss of fast electrons traversing graphene under normal incidence for a broad range of the incident electron kinetic energies. Numerical results are obtained in the cases of one, two, and three layers of graphene. When the incident electron kinetic energy T increases, both the probability density and the total energy loss strongly decrease. It is also found that when the kinetic energy T decreases, the pi and sigma + pi plasmon peak positions move to higher energies omega. In addition, the total energy loss approximately scales with the number of graphene layers N for all observed incident electron kinetic energies. (C) 2015 Elsevier B.V. All rights reserved.
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页码:7 / 10
页数:4
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