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Magnetoplasma spectra of two-dimensional electron rings

✍ Scribed by H.L. Cui; V. Fessatidis; O. Kühn

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
118 KB
Volume
17
Category
Article
ISSN
0749-6036

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✦ Synopsis

A hydrodynamical approach is employed to study the collective excitations of a two-dimensional electron gas confined in a ring geometry, under a normal magnetic field. The theory predicts a rich spectrum of magnetoplasma excitations, with several branches of high- and low-frequency resonances. It is shown that the low-frequency resonances can be identified as edge magnetoplasmons localized at the inner and outer boundaries of the ring, exhibiting their characteristic antidotlike and dot-like features. The high-frequency resonances are essentially bulk twodimensional magnetoplasmons. Our calculated magnetoplasma modes and their associated induced charge densities and dipole moments are compared with a recent experiment, and it is found that most of the experimentally observed features of the spectrum are accounted for with the present theory.

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