Collinear scattering of photoexcited carriers in graphene

TL;DR

This paper presents an analytically solvable model for collinear scattering of photoexcited carriers in graphene, deriving a relaxation time proportional to carrier energy, aligning with recent numerical predictions and applicable at low energies.

Contribution

It introduces a new explicit analytical model for collinear scattering in graphene, providing a clear expression for relaxation time and extending understanding of low-energy carrier dynamics.

Findings

Relaxation time is proportional to photocarrier energy.

Model agrees with recent numerical results.

Applicable at low energies where optical phonon scattering is suppressed.

Abstract

We propose an explicitly solvable model for collinear scattering of photoexcited carriers in intrinsic graphene irradiated by monochromatic light. We find that the collinear scattering rate is directly proportional to the photocarrier energy and derive an analytic expression for the corresponding relaxation time. The result agrees with the recent numerical prediction [Mihnev et al. Nat. Commun. vol. 7, 11617 (2016)] and is able to describe the photocarrier evolution at low energies, where scattering on optical phonons is strongly suppressed.