Inelastic scattering of fast electrons in nanowires: A dielectric formalism approach

被引:30
作者
Zabala, N
Ogando, E
Rivacoba, A
de Abajo, FJG
机构
[1] Univ Basque Country, Elektrika & Elektron Saila Zientzi Fak, Bilbao 48080, Spain
[2] Univ Basque Country, CSIC, Ctr Mixto, San Sebastian 20080, Spain
[3] Univ Basque Country, Donostia Int Phys Ctr, San Sebastian 20080, Spain
[4] Univ Basque Country, Mat Fis Saila Kimika Fak, Donostia San Sebastian 20080, Spain
来源
PHYSICAL REVIEW B | 2001年 / 64卷 / 20期
关键词
D O I
10.1103/PhysRevB.64.205410
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The excitations produced by fast electrons impinging perpendicularly on both metallic and semiconductor cylindrical nanowires are investigated within the framework of dielectric theory. The dependence of the electron energy-loss spectra (EELS) on the nanowire radius is studied in detail, and so is the spatial extension of the induced-charge fluctuations associated to the modes that are excited during the loss process. The limits of applicability of dielectric theory to nanowires are discussed. In particular. comparison between the present theory and EELS measurements performed with silicon nanofibers support the use of dielectric theory at the scale of a few nanometers in diameter. and it is shown that this positive result is justified in terms of the longitudinal pattern of the induced surface plasmons. Finally, the effect of nanowire termination on the electron energy-loss probability for electrons passing near the edge is calculated using the boundary charge method, showing that the range of this effect can extend up to tens of nanometers for low-energy m = 0 modes.
引用
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页数:10
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