Energy Transfer Rate in Double-Layer Graphene Systems: Linear Regime

TL;DR

This paper theoretically analyzes the energy transfer rate in double-layer graphene systems, revealing that the transfer rate is significantly higher than in traditional 2DEG systems and depends on electron temperature differences and densities.

Contribution

It introduces a detailed theoretical model for energy transfer in double-layer graphene using RPA screening and compares it with 2DEG systems, highlighting key quantitative differences.

Findings

Energy transfer rate in DLG is an order of magnitude greater than in 2DEG.

The behavior of energy transfer rate depends on electron temperature differences.

Electron density influences energy transfer differently in DLG compared to 2DEG.

Abstract

We investigate theoretically the energy transfer phenomenon in a double-layer graphene (DLG) system in which two layers are coupled due to the Coulomb interlayer interaction without appreciable interlayer tunneling. We use the balance equation approach and the dynamic and temperature dependent random phase approximation (RPA) screening function in our calculations to obtain the rates of energy transfer between two graphene layers at different layer electron temperatures, densities and interlayer spacings and compare the results with those calculated for the conventional double-layer two-dimensional electron gas (2DEG) systems. In addition, we study the effect of changing substrate dielectric constant on the rate of energy transfer. The general behavior of the energy transfer rate in the DLG is qualitatively similar to that obtained in the double-layer 2DEG but quantitatively its DLG values are an order of magnitude greater. Also, at large electron temperature differences between two layers, the electron density dependence of the energy transfer for the DLG system is significantly different from that found for the double-layer 2DEG system, particularly in case of unequal layer electron densities.