Plasmons in asymmetric double quantum well structures |
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| Authors: | Xin-Hai Liu Xue-Hua Wang Ben-Yuan Gu |
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| Affiliation: | (1) Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080, PR China, CN;(2) CCAST (World Laboratory), PO Box 8730, and Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080, PR China, CN |
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| Abstract: | We investigate the effects of spatial asymmetry, tunneling coupling, and exchange-correlation correction on the plasmon modes in asymmetric double quantum well (DQW) structures in a time-dependent local-density approximation. Special attention is paid to the properties of the ω - mode which is always damped in symmetric DQW systems. In addition, the results on the spectral weight of the excitations are also presented. In general, all the modes carry finite spectral weights and should be observable in resonant inelastic light scattering experiments for the specified values of the parameters. Received 2 July 2002 Published online 19 December 2002 RID="a" ID="a"e-mail: c412-1@aphy.iphy.ac.cn |
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| Keywords: | PACS. 71.15.-m Methods of electronic structure calculations – 73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) – 73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems |
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