Charge screening and carrier transport in AA-stacked bilayer graphene: tuning via a perpendicular electric field

TL;DR

This paper analytically investigates how a perpendicular electric field influences charge screening and electrical conductivity in AA-stacked bilayer graphene, revealing tunable Coulomb interactions and conductivity enhancements.

Contribution

The study provides an analytical framework for understanding and tuning Coulomb interactions and electrical conductivity in AA-stacked bilayer graphene via a perpendicular electric field.

Findings

Screened Coulomb interaction decays as 1/(+V^2), allowing electric field tuning.

Short-range scattering yields constant conductivity unaffected by electric field.

Coulomb scattering conductivity increases linearly with V^2, enabling conductivity control.

Abstract

The static dielectric function in AA-stacked bilayer graphene (BLG), subjected to an electric field applied perpendicular to layers, is calculated analytically within the random phase approximation (RPA). This result is used to calculate the screened Coulomb interaction and the electrical conductivity. The screened Coulomb interaction, which here can be tuned by the perpendicular electric field, shows a power-law decay as $1/(\gamma^{2}+V^2)$ at long-distance limit where $V$ and $\gamma$ are the electrical potential and the inter-layer hopping energy respectively, indicating that the Coulomb interaction is suppressed at high perpendicular electric fields. Furthermore, Our results for the effect of the short-range and the long-range (Coulomb) scattering on the electrical conductivity show that the shot-range scattering yields a constant electrical conductivity which is not affected by the perpendicular electric filed. While the electrical conductivity limited by the Coulomb scattering is enhanced by the perpendicular electric field and increases linearly in $V^2$ at small $V$ with a finite value at $V=0$, indicating that we can tune the electrical conductivity in AA-stacked BLG by applying a perpendicular electric field.