Spatio-temporal dynamics in graphene
Journal article, 2019

Temporally and spectrally resolved dynamics of optically excited carriers in graphene has been intensively studied theoretically and experimentally, whereas carrier diffusion in space has attracted much less attention. Understanding the spatio-temporal carrier dynamics is of key importance for optoelectronic applications, where carrier transport phenomena play an important role. In this work, we provide a microscopic access to the time-, momentum-, and space-resolved dynamics of carriers in graphene. We determine the diffusion coefficient to be D ≈ 360 cm 2 s -1 and reveal the impact of carrier-phonon and carrier-carrier scattering on the diffusion process. In particular, we show that phonon-induced scattering across the Dirac cone gives rise to back-diffusion counteracting the spatial broadening of the carrier distribution.

Author

Roland Jago

Chalmers, Physics, Condensed Matter Theory

Raul Perea Causin

Chalmers, Physics, Condensed Matter Theory

Samuel Brem

Chalmers, Physics, Condensed Matter Theory

Ermin Malic

Chalmers, Physics, Condensed Matter Theory

Nanoscale

2040-3364 (ISSN)

Vol. 11 20 10017-10022

Subject Categories

Economic Geography

Atom and Molecular Physics and Optics

Other Physics Topics

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1039/c9nr01714c

PubMed

31080988

More information

Latest update

7/12/2019