Dynamic-polarization forces on fast ions and molecules moving over supported graphene
Dynamic-polarization forces on fast ions and molecules moving over supported graphene
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DOI：
10.1103/physreva.76.042901
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发表时间：
2007-10
影响因子：
2.9
通讯作者：
I. Radović;L. Hadžievski;N. Bibić;Z. Mišković
中科院分区：
文献类型：
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作者：
I. Radović;L. Hadžievski;N. Bibić;Z. Mišković
我们使用二维双流体流体动力学模型来描述碳价电子对快速离子和电偶极子的高频等离子激元激发，它们平行于由绝缘衬底支撑的单层石墨烯。我们计算了由石墨烯的动态极化引起的离子和偶极子的停止力和成像力，以及偶极子围绕其质心的动态扭矩。虽然离子通道的结果与之前在电介质中通过碳纳米管的离子通道的结果相似，但偶极子上的停止力和成像力表现出强烈的方向依赖性。点偶极子上的扭矩意味着在低速运动方向上有很强的对齐效应，以及偶极子在高速下在石墨烯上“滚动”的趋势。
We use a two-dimensional, two-fluid hydrodynamic model to describe the high-frequency plasmon excitations of the carbon valence electrons responding to fast ions and electric dipoles, which move parallel to a single sheet of graphene supported by an insulating substrate. We calculate the stopping and the image forces on ions and dipoles, as well as the dynamic torque on dipoles about their center of mass, resulting from the dynamic polarization of graphene. While the results for ions are similar to those obtained earlier for ion channeling through carbon nanotubes in dielectric media, the stopping and the image forces on dipoles show strong directional dependencies. The torque on point dipoles implies a strong alignment effect in the direction of motion at lower speeds, as well as a tendency of the dipole to 'roll' over the graphene at high speeds.