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arXiv · 2407.16579

Nonlinear screening and charge redistribution in periodically doped graphene

K. A. Baryshnikov·A. V. Gert·Yu. B. Vasilyev·A. P. Dmitriev
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Abstract

The screening problem for the Coulomb potential of a charge located in a two-dimensional (2D) system has an intriguing solution with a power law distance screening factor due to out-of-plane electrical fields. This is crucially different from a three-dimensional case with exponential screening. The long-range action of electric fields results in the effective inflow of electrons from high-doped regions to low-doped regions of a 2D heterostructure. In graphene and other materials with linear energy spectrum for electrons, such inflow in low-doped regions also occurs, but its effectiveness is dependent on doping level. This can be used for fabricating high-mobility conducting channels. We provide the theory for determining electron potential and concentration in a periodically doped graphene sheet along one dimension taking into account all effects of long-range 2D screening. This results in a substantially nonlinear integro-differential problem, which is solved numerically via computationally cheap algorithm. Similar nonlinear problems arise in a wide range of doped 2D heterostructures made of linear spectrum materials.

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K. A. Baryshnikov, A. V. Gert, Yu. B. Vasilyev, A. P. Dmitriev. 2024-07-23. Nonlinear screening and charge redistribution in periodically doped graphene. https://arxiv.org/abs/2407.16579

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