Optical and magneto-optical far-infrared properties of bilayer graphene

TL;DR

This paper investigates the far-infrared optical and magneto-optical properties of bilayer graphene, revealing denser absorption spectra and polarization-dependent features that can probe its quantum Hall ground state.

Contribution

It provides a detailed analysis of bilayer graphene's spectroscopic features, highlighting differences from monolayer graphene and proposing methods to test its quantum Hall ground state.

Findings

Denser inter-Landau-level absorption spectrum in bilayer graphene

Polarization dependence of the lowest energy peak

Potential to test the bilayer ground state in quantum Hall regime

Abstract

We analyze the spectroscopic features of bilayer graphene determined by the formation of pairs of low-energy and split bands in this material. We show that the inter-Landau-level absorption spectrum in bilayer graphene at high magnetic field is much denser in the far-infrared range than that in monolayer material, and that the polarization dependence of its lowest energy peak can be used to test the form of the bilayer ground state in the quantum Hall-effect regime.