Magnetoplasma spectra of two-dimensional electron rings |
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| Affiliation: | 1. School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, PR China;2. Center of Teaching Experiment and Equipment Management, Qiqihar University, Qiqihar 161006, PR China;3. The institute of Chemistry, Faculty of Science, University of Okara, Renala Campus, Punjab 56300, Pakistan;4. Yunnan Key Laboratory of Metal-Organic Molecular Materials and Devices, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China;1. Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan 430070, Hubei, China;2. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China;3. Blue Minerals Consultancy, Wattle Grove, Tasmania 7109, Australia;1. Department of Physics, Wuhan University of Technology, Wuhan, 430070, China;2. School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China |
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| Abstract: | 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 held. 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 antidot-like and dot-like features. The high-frequency resonances are essentially bulk two-dimensional 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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