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论文类型：期刊论文

发表时间：2014-04-18

发表刊物：PHYSICS LETTERS A

收录刊物：SCIE、Scopus

卷号：378

期号：22-23

页面范围：1626-1631

ISSN号：0375-9601

摘要：We investigate the interactions of external charged particles with a double-layered two-dimensional quantum electron gas (2DQEG), describing its collective or plasmon excitations by using the linearized quantum hydrodynamic (QHD) model. General expressions are derived for electron densities in the two layers, the induced potential, and the stopping and image forces on an external charged particle. Our calculations indicate that an oscillatory wake effect arises in the induced potential for a particle moving parallel the 2DQEG layers. In addition, double peaks are found in the stopping and image forces due to plasmon hybridization between the two 2DQEG layers. Finally, the induced number density in the double-layered 2DQEG is compared with the case of a single-layer 2DQEG supported by an insulating substrate. (C) 2014 Elsevier B.V. All rights reserved.