# Tunable quantum interference in bilayer graphene in double-resonant Raman scattering

## TL;DR

This study investigates how the electronic lifetime affects the double-resonant 2D Raman mode in bilayer graphene, revealing that the line shape varies with electronic broadening and explaining experimental observations.

## Contribution

It provides a combined experimental and theoretical analysis showing the dependence of Raman scattering processes on electronic broadening in bilayer graphene.

## Key findings

- The 2D Raman mode line shape depends on electronic lifetime.
- The ratio of symmetric to anti-symmetric processes varies with electronic broadening.
- Electronic lifetime influences the Raman spectral features in bilayer graphene.

## Abstract

The line shape of the double-resonant $2D$ Raman mode in bilayer graphene is often considered to be characteristic for a certain laser excitation energy. Here, in a joint experimental and theoretical study, we analyze the dependence of the double-resonant Raman scattering processes in bilayer graphene on the electronic broadening parameter $\gamma$. We demonstrate that the ratio between symmetric and anti-symmetric scattering processes sensitively depends on the lifetime of the electronic states, explaining the experimentally observed variation of the complex $2D$-mode line shape.