Thermopower of gapped bilayer graphene

TL;DR

This paper investigates how applying an electric field to open a band gap in bilayer graphene significantly increases its thermopower, with detailed analysis of impurity effects and temperature dependence.

Contribution

It demonstrates that a band gap enhances thermopower in bilayer graphene and analyzes impurity scattering and temperature effects.

Findings

Thermopower in gapped bilayer graphene exceeds four times that of monolayer graphene.

Impurity scattering effects are modeled using the self-consistent Born approximation.

Thermopower shows notable temperature dependence.

Abstract

We calculate thermopower of clean and impure bilayer graphene systems. Opening a band gap through the application of an external electric field is shown to greatly enhance the thermopower of bilayer graphene, which is more than four times that of the monolayer graphene and gapless bilayer graphene at room temperature. The effect of scattering by dilute charged impurities is discussed in terms of the self-consistent Born approximation. Temperature dependence of the thermopower is also analyzed.