Spatio-temporal dynamics in graphene
Artikel i vetenskaplig tidskrift, 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.

Författare

Roland Jago

Chalmers, Fysik, Kondenserade materiens teori

Raul Perea Causin

Chalmers, Fysik, Kondenserade materiens teori

Samuel Brem

Chalmers, Fysik, Kondenserade materiens teori

Ermin Malic

Chalmers, Fysik, Kondenserade materiens teori

Nanoscale

2040-3364 (ISSN)

Vol. 11 20 10017-10022

Ämneskategorier

Ekonomisk geografi

Atom- och molekylfysik och optik

Annan fysik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1039/c9nr01714c

PubMed

31080988

Mer information

Senast uppdaterat

2019-07-12