# Edge magnetoplasmons in graphene: Effects of gate screening and dissipation

## TL;DR

This paper investigates edge magnetoplasmons in graphene under magnetic fields, analyzing how gate screening and dissipation affect their dispersion, velocity, and attenuation, with results aligning with recent experimental observations.

## Contribution

It provides a comprehensive analysis of magnetoplasmon behavior in graphene considering gate screening and dissipation effects, combining numerical and analytical methods.

## Key findings

- Magnetoplasmon velocity decreases with nearby gate presence.
- Velocity oscillates as a function of Landau level filling factor.
- Dissipation causes frequency suppression near Landau level centers.

## Abstract

Magnetoplasmons on graphene edge in quantizing magnetic field are investigated at different Landau level filling factors. To find the mode frequency, the optical conductivity tensor of disordered graphene in magnetic field is calculated in the self-consistent Born approximation, and the nonlocal electromagnetic problem is solved using the Wiener-Hopf method. Magnetoplasmon dispersion relations, velocities and attenuation lengths are studied numerically and analytically with taking into account the screening by metallic gate and the energy dissipation in graphene. The magnetoplasmon velocity decreases in the presence of nearby gate and oscillates as a function of the filling factor because of the dissipation induced frequency suppression occurring when the Fermi level is located near the centers of Landau levels, in agreement with the recent experiments.