Quadrupole plasmon excitations in confined one-dimensional systems
A new mode of electronic collective excitations (quadrupole plasmon) in confined one-dimensional electronic systems is predicted herein by an eigen-equation method. The eigen equation based on the time-dependent density-functional theory is presented for calculating the collective excitations in con...
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Published in | Europhysics letters Vol. 108; no. 2; pp. 27001 - p1-27001-p5 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Les Ulis
EDP Sciences, IOP Publishing and Società Italiana di Fisica
01.10.2014
IOP Publishing |
Subjects | |
Online Access | Get full text |
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Summary: | A new mode of electronic collective excitations (quadrupole plasmon) in confined one-dimensional electronic systems is predicted herein by an eigen-equation method. The eigen equation based on the time-dependent density-functional theory is presented for calculating the collective excitations in confined systems. With this method, all modes of collective excitations in the 1D systems may be found out. These modes include dipole plasmons and quadrupole plasmons. The dipole plasmon mode corresponds to the antisymmetric oscillation of the induced charge, and can be shown as a resonance of the dipole response. In the quadrupole plasmon modes, the induced-charge distribution is symmetric, and the dipole response vanishes. The motion of the electrons in the quadrupole modes is similar to the vibration of atoms in the breathing mode of phonons. This type of plasmons can be shown as a resonance of the quadrupole response, and has to be excited by a nonuniform field. |
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Bibliography: | ark:/67375/80W-PSVSX3G0-H publisher-ID:epl16571 istex:067A0D5AE5EDE8BE2E5243E7F2A91401771E7236 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0295-5075 1286-4854 |
DOI: | 10.1209/0295-5075/108/27001 |