基底性质对二维层状电子气感应电场的影响
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摘要
采用线性化量子流体动力学模型,研究了载能粒子与二维层状电子气相互作用时的集体静电激发现象。在适当的边界条件下推导出感应电势,入射粒子所受的阻止力和侧向力的一般表达式,讨论了存在绝缘基底情况下基底介电常数对感应电势、阻止力及侧向力的影响。结果表明:当入射粒子速度较小时,基底的极化电场较弱,其介电常数的变化对感应电场几乎无影响,而当速度较高时因极化电场较强而影响很大;入射粒子距离与基底相连的电子气平面越近,基底介电常数对各物理量的影响越大。
The collective electric excitations in layered two-dimensional electron gases supported by an insulating substrate induced by a moving charged particle are investigated using linearized quantum hydrodynamic(LQHD)theory.General expressions of the induced potential,the stopping and image forces acting on the incident particle are derived by selecting appropriate boundary conditions.The influence of dielectric constant on induced potential,the stopping and image forces is discussed.Numerical results indicate that the substrate property has little influence on the induced electric field at smaller incident particle speed due to the weaker polarized electric field but the influence is remarkable at higher speed due to the stronger polarized electric field;the smaller the distance between the incident charged particle and the electron gas plane connected to the substrate,the more the influence of dielectric constant on relevant physics properties.
The collective electric excitations in layered two-dimensional electron gases supported by an insulating substrate induced by a moving charged particle are investigated using linearized quantum hydrodynamic(LQHD)theory.General expressions of the induced potential,the stopping and image forces acting on the incident particle are derived by selecting appropriate boundary conditions.The influence of dielectric constant on induced potential,the stopping and image forces is discussed.Numerical results indicate that the substrate property has little influence on the induced electric field at smaller incident particle speed due to the weaker polarized electric field but the influence is remarkable at higher speed due to the stronger polarized electric field;the smaller the distance between the incident charged particle and the electron gas plane connected to the substrate,the more the influence of dielectric constant on relevant physics properties.
引文
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[3]廖威,王海军,刘春明,等.CO2激光单点修复对光束焦斑能量损失的影响[J].强激光与粒子束,2013,25(12):3201-3204.(Liao Wei,Wang Haijun,Liu Chunming,et al.Energy loss in focal spot by CO2laser mitigation treatment.High Power Laser and Particle Beams,2013,25(12):3201-3204)
[4]王园明,郭晓强,罗尹虹,等.质子和中子在硅中位移损伤等效性计算[J].强激光与粒子束,2013,25(7):1803-1806.(Wang Yuanming,Guo Xiaoqiang,Luo Yinhong,et al.Calculation of equivalence of proton and neutron displacement damage in silicon.High Power Laser and Particle Beams,2013,25(7):1803-1806)
[5]傅涛,杨梓强,兰峰,等.二维等离子体填充金属光子晶体腔体特性[J].强激光与粒子束,2014,26:043001.(Fu Tao,Yang Ziqiang,Lan Feng,et al.Analysis of 2Dplasma-filled metallic photonic crystal cavity.High Power Laser and Particle Beams,2014,26:043001)
[6]王雅丽,李喜波,罗江山,等.等离子体气相凝聚技术制备银纳米团簇及粒径尺寸控制[J].强激光与粒子束,2014,26:082001.(Wang Yali,Li Xibo,Luo Jiangshan,et al.Fabrication of Ag nanocluster and adjustment of particle size by plasma vapor deposition.High Power Laser and Particle Beams,2014,26:082001)
[7]Castro Neto A H,Guinea F,Peres N M R,et al.The electronic properties of graphene[J].Rev Mod Phys,2009,81:109-162.
[8]Adam S,Hwang E H,Rossi E,et al.Theory of charged impurity scattering in two-dimensional graphene[J].Solid State Commun,2009,149:1072-1079.
[9]Sonde S,Giannazzo F,Raineri V,et al.Dielectric thickness dependence of capacitive behavior in graphene deposited on silicon dioxide[J].Vac Sci Technol B,2009,27(2):868-873.
[10]Zhou S Y,Gweon G H,Fedorov A V,et al.Substrate-induced bandgap opening in epitaxial graphene[J].Nat Mater,2007,6:770-775.
[11]Wintterlin J,Bocquet M L.Graphene on metal surfaces[J].Surf Sci,2009,603:1841-1852.
[12]Kramberger C,Hambach R,Giorgetti C,et al.Linear plasmon dispersion in single-wall carbon nanotubes and the collective excitation spectrum of graphene[J].Phys Rev Lett,2008,100:196803.
[13]Mowbray D J,Mikovic'Z L,Goodman F O.Ion interactions with carbon nanotubes in dielectric media[J].Phys Rev B,2006,74:195435.
[14]Radovic I,Borka D.Interactions of fast charged particles with supported two-dimensional electron gas:One-fluid model[J].Phys Lett A,2010,374(13):1527-1533.
[15]Radovic I,Jovanovic V B,Borka D,et al.Interactions of slowly moving charges with graphene:The role of substrate phonons[J].Nucl Instrum Methods Phys Res Sect B,2012,279:165-168.
[16]Li C Z,Wang Y N,Song Y H,et al.Interactions of charged particle beams with double-layered two-dimensional quantum electron gases[J].Phys Lett A,2014,378(22):1626-1631.
[17]李春芝,菅阳阳,何颖卓.带电粒子与二维电子气相互作用的理论研究[J].内蒙古民族大学学报:自然科学版,2014,29(1):1-3.(Li Chunzhi,Jian Yangyang,He Yingzhuo.Theoretical study on interaction of charged particle with two dimensional electron gases.Journal of Inner Mongolia University for Nationalities,2014,29(1):1-3)
[18]Haas F,Manfredi G,Feix M.Multistream model for quantum plasmas[J].Phys Rev E,2000,62(2):2763-2772.