Magnetism of an adatom on biased AA-stacked bilayer graphene

TL;DR

This paper investigates how an adatom's magnetism on AA-stacked bilayer graphene can be controlled by bias voltage, revealing unique magnetic phase diagrams influenced by the density of states and broadening effects.

Contribution

It introduces a detailed analysis of adatom magnetism on AA-stacked bilayer graphene, highlighting the impact of bias voltage and the unique density of states on magnetic phases.

Findings

Magnetic phase diagrams depend on adatom energy levels.

Bias voltage can control adatom magnetization.

Unique DOS effects influence magnetic behavior.

Abstract

We study magnetism of an adatom adsorbed on AA-stacked bilayer graphene (BLG) in both unbiased and biased cases, using the Anderson impurity model. We find different magnetic phase diagrams for the adatom, depending on the energy level of the adatom, which varies from the magnetic phase diagram of adatom in normal metals to that in graphene. This is due to the individual energy dependence of the density of states (DOS) of AA-stacked BLG and anomalous broadening of the adatom energy level. Furthermore we investigate the effect of a bias voltage on DOS of AA-stacked and show that the magnetization of the adatom can be controlled by applying the bias voltage. This allows for possibility of using AA-stacked BLG in spintronic devices.