Iranian Journal of Physics Research

Density-wave instability and impurity screening in graphene based double-layer structures/ RETRACTED ARTICLE

Authors

S Rastegar 1
S Abedinpour Harzand 2

1 1. Department of Physics, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, Iran

2 2. Department of Physics, Institute for Advanced Studies in Basic Sciences, GavaZang, Zanjan, Iran

Abstract
(RETRACT ARTICLE )
In this study, we investigate the density-wave instability and impurity screening in graphene-based double-layer structures. We assume that at least one of two layers is graphene, while the second layer could be made of graphene, conventional two-dimensional electron gas, or any other two-dimensional structure. We calculate the static dielectric function of this graphene-based double-layer structure whitin the random phase approximation, and look for the possibility of density-wave instability, changing different system parameters like the electronic density and layer spacing between two layers. In this investigation we have not seen any instability in double-layer structures consisting of coupled layers of graphene, the 2D electron gas and the gapped graphene. Finally, using static dielectric function and considering a charged impurity placed in the first layer, we show that how this impurity is screened in the first and second layers.

Keywords

graphene
double-layer structures
dielectric function
random phase approximation
density-wave instability
screening
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