期刊
PHYSICS LETTERS A
卷 378, 期 40, 页码 2995-3000出版社
ELSEVIER
DOI: 10.1016/j.physleta.2014.08.013
关键词
Dipole plasmon; Quadrupole plasmon; Eigen-equation; Quasi-one-dimensional system
资金
- National Natural Science Foundation of China [10774041]
An eigen-equation of plasmon excitation in confined quasi-one-dimensional systems is presented. Besides dipole plasmons, quadrupole plasmons are found in the systems by comparing the eigen-solutions with the dipole response. For both dipole and quadrupole plasmons, the plasmon frequencies decrease with the increase of the system's length, and their size dependence can be well fitted by the plasmon dispersion in the infinite systems calculated by the random phase approximation. Through extensively studies of eigen-charge density and induced charge density, we find that quadrupole plasmon corresponds to symmetric charge density distribution, and can only be excited by non-uniform electric field. (C) 2014 Elsevier B.V. All rights reserved.
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