Electronic collective excitations in thin toroids

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Abstract

The elementary excitations of electron gases confined to a toroid system are studied within the random-phase approximation. They strongly depend on the angular momentum (L), the toroid geometry (radius and height), and the intertoroid coupling. The angular momentum is conserved in the electron-electron interactions, owing to the cylindrical symmetry. The electronic collective excitations (plasmons) of different L's are thus mutally decoupled. The plasma oscillation for a giving L behaves as a standing wave on a toroid of radius R, which occurs at the discrete wavelength 2π R/L. Intertoroid interaction for two parallel toroids has been included. It causes two plasmon branches for each L. The plasmon with the higher frequency will exhibit the relatively pronounced excitation spectrum.

Original languageEnglish
Pages (from-to)498-508
Number of pages11
JournalChinese Journal of Physics
Volume37
Issue number5
Publication statusPublished - 1999

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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