Time-resolved magneto-Raman study of carrier dynamics in low Landau levels of graphene

TL;DR

This study uses time-resolved Raman scattering to investigate how electrons relax in graphene under Landau quantization, revealing a sharp increase in relaxation rate at resonance conditions, providing new insights into electron dynamics.

Contribution

It introduces a novel time-resolved Raman approach to analyze carrier relaxation in Landau-quantized graphene, highlighting resonance effects beyond Auger scattering mechanisms.

Findings

Relaxation rate sharply increases at Landau transition and G-band resonance.

Field dependence of relaxation rates was characterized.

Provides new understanding of electron relaxation mechanisms in graphene.

Abstract

We study the relaxation dynamics of the electron system in graphene flakes under Landau quantization regime using a novel approach of time-resolved Raman scattering. The non-resonant character of the experiment allows us to analyze the field dependence of the relaxation rate. Our results clearly evidence sharp increase in the relaxation rate upon the resonance between the energy of the Landau transition and the G-band and shed new light on relaxation mechanism of the Landau-quantized electrons in graphene beyond the previously studied Auger scattering.