Magneto-optical properties of multilayer graphenes

TL;DR

This paper theoretically investigates the magneto-optical absorption spectra of multilayer graphene, revealing how the spectra can be understood through monolayer or bilayer components and proposing experimental observation methods.

Contribution

It introduces a systematic way to analyze multilayer graphene spectra by decomposing them into monolayer or bilayer-like subcomponents, enhancing understanding of their optical properties.

Findings

Spectra decompose into monolayer or bilayer-like components

Odd-layered graphene shows sqrt(B) shifted peaks

Monolayer-like spectra can be observed in mixed multilayer samples

Abstract

The magneto-optical absorption properties of graphene multilayers are theoretically studied. It is shown that the spectrum can be decomposed into sub-components effectively identical to the monolayer or bilayer graphene, allowing us to understand the spectrum systematically as a function of the layer number. Odd-layered graphenes always exhibit absorption peaks which shifts in proportion to sqrt(B), with B being the magnetic field, due to the existence of an effective monolayer-like subband. We propose a possibility of observing the monolayer-like spectrum even in a mixture of multilayer graphene films with various layers numbers.