Intrinsic and extrinsic decay of edge magnetoplasmons in graphene

TL;DR

This study explores how edge magnetoplasmons in graphene quantum Hall systems decay intrinsically and extrinsically, revealing nonlinear dispersion and lower dissipation compared to traditional materials, through high-frequency measurements.

Contribution

It provides the first detailed analysis of EMP decay mechanisms in graphene, highlighting the roles of intrinsic interactions and extrinsic localized states.

Findings

EMP dispersion in graphene is nonlinear due to interactions.

Intrinsic decay arises from EMP wavepacket interactions.

Extrinsic dissipation involves interaction with localized bulk states.

Abstract

We investigate intrinsic and extrinsic decay of edge magnetoplasmons (EMPs) in graphene quantum Hall (QH) systems by high-frequency electronic measurements. From EMP resonances in disk shaped graphene, we show that the dispersion relation of EMPs is nonlinear due to interactions, giving rise to intrinsic decay of EMP wavepacket. We also identify extrinsic dissipation mechanisms due to interaction with localized states in bulk graphene from the decay time of EMP wavepackets. We indicate that, owing to the unique linear and gapless band structure, EMP dissipation in graphene can be lower than that in GaAs systems.