The Modulation of de Haas-van Alphen Effect in Graphene by Electric Field

TL;DR

This study investigates how an in-plane electric field influences the de Haas-van Alphen effect in graphene, revealing modulation of magnetization and susceptibility, oscillation amplitude behavior, and non-linear magnetic properties due to graphene's unique Landau levels.

Contribution

It demonstrates the electric field's modulation of dHvA oscillations and magnetic properties in graphene, highlighting effects not observed in conventional 2D electron gases.

Findings

Magnetization and susceptibility diverge at a critical electric field parameter

Oscillation amplitude peaks infinitely at the critical point at zero temperature

Graphene exhibits non-linear magnetic behavior under external electric and magnetic fields

Abstract

This paper is to explore the de Haas-van Alphen effect $(dHvA)$ of graphene in the presence of an in-plane uniform electric field. Three major findings are yielded. First of all, the electric field is found to modulate the de Haas-van Alphen magnetization and magnetic susceptibility through the dimensionless parameter $(\beta =\frac{E}{\upsilon_{F}B})$. As the parameter $\beta$ increases, the values of magnetization and magnetic susceptibility increase to positive infinity or decrease to negative infinity at the exotic point $\beta_{c}=1$. Besides, the $dHvA$ oscillation amplitude rises abruptly to infinity for zero temperature at $\beta_{c}=1$, but eventually collapses at a finite temperature thereby leading to the vanishing of de Haas-van Alphen effect. In addition, the magnetic susceptibility depends on the electric and magnetic fields, suggesting that the graphene should be a non-linear magnetic medium in the presence of the external field. These results, which are different from those obtained in the standard nonrelativistic 2D electron gas, are attributed to its anomalous Landau level spectrum in graphene.