Kalinić Ana, Radović Ivan, Karbunar Lazar, Despoja Vito, Mišković Zoran L
Department of Atomic Physics, Vinča Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia.
School of Computing, Union University, Knez Mihailova 6, 11000 Belgrade, Serbia.
Nanomaterials (Basel). 2024 Dec 5;14(23):1951. doi: 10.3390/nano14231951.
The aim of this study is to explore the potential which arises in a graphene-insulator-graphene structure when an external charged particle is moving parallel to it with a speed smaller than the Fermi speed in graphene. This is achieved by employing the dynamic polarization function of graphene within the random phase approximation, where its π electrons are modeled as Dirac fermions, and utilizing a local dielectric function for bulk insulators. Three different insulators are considered: SiO, HfO, and AlO. It is observed that the wake potential is induced by the surface optical phonons originating from the insulator layer, and that total potential could be effectively decomposed into two components, each corresponding to different phonon branches, as long as those branches do not interact amongst themselves.
本研究的目的是探索当一个外部带电粒子以小于石墨烯中费米速度的速度平行于石墨烯-绝缘体-石墨烯结构移动时所产生的电势。这是通过在随机相位近似下利用石墨烯的动态极化函数来实现的，其中其π电子被建模为狄拉克费米子，并对块状绝缘体使用局部介电函数。考虑了三种不同的绝缘体：SiO、HfO和AlO。观察到尾流电势是由源自绝缘层的表面光学声子诱导产生的，并且只要这些声子分支之间不相互作用，总电势就可以有效地分解为两个分量，每个分量对应于不同的声子分支。
