Carrier scattering from dynamical magneto-conductivity in quasi-neutral epitaxial graphene

TL;DR

This study investigates how electronic scattering rates depend on energy in quasi-neutral epitaxial graphene, revealing a linear increase in scattering rate with energy and constant Landau level resolution across magnetic fields.

Contribution

It provides new insights into energy-dependent scattering mechanisms and Landau level behavior in epitaxial graphene, based on Landau level spectroscopy.

Findings

Scattering rate increases linearly with energy.

Number of resolved Landau levels remains constant with magnetic field.

Insights into carrier mobility and scattering mechanisms.

Abstract

The energy-dependence of the electronic scattering time is probed by Landau level spectroscopy in quasi neutral multilayer epitaxial graphene. From the Landau levels broadening we find that the scattering rate increases linearly with energy. This implies a surprising property of the Landau level spectrum in graphene - the number of the resolved Landau levels remains constant with the applied magnetic field. Insights are given about possible scattering mechanism and carrier mobilities in the graphene system investigated.