Interactions of charged particle beams with double-layered two-dimensional quantum electron gases |
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| Institution: | 1. College of Physics and Electronic Information, Inner Mongolia University for the Nationalities, Tongliao 028043, China;2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023, China;3. Department of Applied Mathematics and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada |
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| Abstract: | 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. |
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